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Finding the Fourth Proportional to 864.14, 1,192.65 and 515.03

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Solution

The fourth proportional to 864.14, 1,192.65 and 515.03 is: 710.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.14 : 1,192.65 = 515.03 : x
  2. Step 2: Convert to fraction form
    864.14/1,192.65 = 515.03/x
  3. Step 3: Cross multiply
    864.14x = 1,192.65 × 515.03
  4. Step 4: Simplify right side
    864.14x = 614,250.53
  5. Step 5: Solve for x
    x = 614,250.53/864.14
  6. Step 6: Final answer
    x = 710.82

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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.