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Finding the Fourth Proportional to 708.18, 1,061.12 and 433.44

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Solution

The fourth proportional to 708.18, 1,061.12 and 433.44 is: 649.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.18 : 1,061.12 = 433.44 : x
  2. Step 2: Convert to fraction form
    708.18/1,061.12 = 433.44/x
  3. Step 3: Cross multiply
    708.18x = 1,061.12 × 433.44
  4. Step 4: Simplify right side
    708.18x = 459,930.28
  5. Step 5: Solve for x
    x = 459,930.28/708.18
  6. Step 6: Final answer
    x = 649.45

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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.