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Finding the Fourth Proportional to 761.91, 1,135.92 and 715.43

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Solution

The fourth proportional to 761.91, 1,135.92 and 715.43 is: 1,066.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.91 : 1,135.92 = 715.43 : x
  2. Step 2: Convert to fraction form
    761.91/1,135.92 = 715.43/x
  3. Step 3: Cross multiply
    761.91x = 1,135.92 × 715.43
  4. Step 4: Simplify right side
    761.91x = 812,676.77
  5. Step 5: Solve for x
    x = 812,676.77/761.91
  6. Step 6: Final answer
    x = 1,066.64

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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.