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Finding the Fourth Proportional to 630.75, 869.47 and 443.73

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Solution

The fourth proportional to 630.75, 869.47 and 443.73 is: 611.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.75 : 869.47 = 443.73 : x
  2. Step 2: Convert to fraction form
    630.75/869.47 = 443.73/x
  3. Step 3: Cross multiply
    630.75x = 869.47 × 443.73
  4. Step 4: Simplify right side
    630.75x = 385,809.92
  5. Step 5: Solve for x
    x = 385,809.92/630.75
  6. Step 6: Final answer
    x = 611.67

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Find fourth proportional to 315.38, 434.74 and 221.87
Half scale
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Double scale
Find fourth proportional to 631.75, 870.85 and 444.73
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.