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Finding the Fourth Proportional to 630.75, 870.44 and 354.75

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Solution

The fourth proportional to 630.75, 870.44 and 354.75 is: 489.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.75 : 870.44 = 354.75 : x
  2. Step 2: Convert to fraction form
    630.75/870.44 = 354.75/x
  3. Step 3: Cross multiply
    630.75x = 870.44 × 354.75
  4. Step 4: Simplify right side
    630.75x = 308,786.82
  5. Step 5: Solve for x
    x = 308,786.82/630.75
  6. Step 6: Final answer
    x = 489.56

Related Problems

Find fourth proportional to 315.38, 435.22 and 177.38
Half scale
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Double scale
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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.