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Finding the Fourth Proportional to 723.31, 1,085.57 and 655.27

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Solution

The fourth proportional to 723.31, 1,085.57 and 655.27 is: 983.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.31 : 1,085.57 = 655.27 : x
  2. Step 2: Convert to fraction form
    723.31/1,085.57 = 655.27/x
  3. Step 3: Cross multiply
    723.31x = 1,085.57 × 655.27
  4. Step 4: Simplify right side
    723.31x = 711,341.45
  5. Step 5: Solve for x
    x = 711,341.45/723.31
  6. Step 6: Final answer
    x = 983.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.