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Finding the Fourth Proportional to 715.28, 986.99 and 400.55

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Solution

The fourth proportional to 715.28, 986.99 and 400.55 is: 552.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.28 : 986.99 = 400.55 : x
  2. Step 2: Convert to fraction form
    715.28/986.99 = 400.55/x
  3. Step 3: Cross multiply
    715.28x = 986.99 × 400.55
  4. Step 4: Simplify right side
    715.28x = 395,331.91
  5. Step 5: Solve for x
    x = 395,331.91/715.28
  6. Step 6: Final answer
    x = 552.70

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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.