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Finding the Fourth Proportional to 761.93, 1,136.92 and 715.49

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Solution

The fourth proportional to 761.93, 1,136.92 and 715.49 is: 1,067.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.93 : 1,136.92 = 715.49 : x
  2. Step 2: Convert to fraction form
    761.93/1,136.92 = 715.49/x
  3. Step 3: Cross multiply
    761.93x = 1,136.92 × 715.49
  4. Step 4: Simplify right side
    761.93x = 813,451.31
  5. Step 5: Solve for x
    x = 813,451.31/761.93
  6. Step 6: Final answer
    x = 1,067.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.