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Finding the Fourth Proportional to 765.41, 1,139.99 and 761.67

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Solution

The fourth proportional to 765.41, 1,139.99 and 761.67 is: 1,134.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.41 : 1,139.99 = 761.67 : x
  2. Step 2: Convert to fraction form
    765.41/1,139.99 = 761.67/x
  3. Step 3: Cross multiply
    765.41x = 1,139.99 × 761.67
  4. Step 4: Simplify right side
    765.41x = 868,292.37
  5. Step 5: Solve for x
    x = 868,292.37/765.41
  6. Step 6: Final answer
    x = 1,134.42

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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.