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Finding the Fourth Proportional to 765.57, 1,148.61 and 245.66

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Solution

The fourth proportional to 765.57, 1,148.61 and 245.66 is: 368.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.57 : 1,148.61 = 245.66 : x
  2. Step 2: Convert to fraction form
    765.57/1,148.61 = 245.66/x
  3. Step 3: Cross multiply
    765.57x = 1,148.61 × 245.66
  4. Step 4: Simplify right side
    765.57x = 282,167.53
  5. Step 5: Solve for x
    x = 282,167.53/765.57
  6. Step 6: Final answer
    x = 368.57

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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.