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Finding the Fourth Proportional to 864.34, 1,192.79 and 515

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Solution

The fourth proportional to 864.34, 1,192.79 and 515 is: 710.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.34 : 1,192.79 = 515 : x
  2. Step 2: Convert to fraction form
    864.34/1,192.79 = 515/x
  3. Step 3: Cross multiply
    864.34x = 1,192.79 × 515
  4. Step 4: Simplify right side
    864.34x = 614,286.85
  5. Step 5: Solve for x
    x = 614,286.85/864.34
  6. Step 6: Final answer
    x = 710.70

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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.