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Finding the Fourth Proportional to 712.29, 981.87 and 501.87

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Solution

The fourth proportional to 712.29, 981.87 and 501.87 is: 691.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.29 : 981.87 = 501.87 : x
  2. Step 2: Convert to fraction form
    712.29/981.87 = 501.87/x
  3. Step 3: Cross multiply
    712.29x = 981.87 × 501.87
  4. Step 4: Simplify right side
    712.29x = 492,772.96
  5. Step 5: Solve for x
    x = 492,772.96/712.29
  6. Step 6: Final answer
    x = 691.81

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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.