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Finding the Fourth Proportional to 871.74, 1,202.99 and 478.76

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Solution

The fourth proportional to 871.74, 1,202.99 and 478.76 is: 660.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.74 : 1,202.99 = 478.76 : x
  2. Step 2: Convert to fraction form
    871.74/1,202.99 = 478.76/x
  3. Step 3: Cross multiply
    871.74x = 1,202.99 × 478.76
  4. Step 4: Simplify right side
    871.74x = 575,935.08
  5. Step 5: Solve for x
    x = 575,935.08/871.74
  6. Step 6: Final answer
    x = 660.67

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Double scale
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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.