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Finding the Fourth Proportional to 715.31, 986.89 and 400.53

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Solution

The fourth proportional to 715.31, 986.89 and 400.53 is: 552.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.31 : 986.89 = 400.53 : x
  2. Step 2: Convert to fraction form
    715.31/986.89 = 400.53/x
  3. Step 3: Cross multiply
    715.31x = 986.89 × 400.53
  4. Step 4: Simplify right side
    715.31x = 395,279.05
  5. Step 5: Solve for x
    x = 395,279.05/715.31
  6. Step 6: Final answer
    x = 552.60

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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.