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Finding the Fourth Proportional to 765.71, 1,148.70 and 505.93

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Solution

The fourth proportional to 765.71, 1,148.70 and 505.93 is: 758.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.71 : 1,148.70 = 505.93 : x
  2. Step 2: Convert to fraction form
    765.71/1,148.70 = 505.93/x
  3. Step 3: Cross multiply
    765.71x = 1,148.70 × 505.93
  4. Step 4: Simplify right side
    765.71x = 581,157.71
  5. Step 5: Solve for x
    x = 581,157.71/765.71
  6. Step 6: Final answer
    x = 758.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.