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Finding the Fourth Proportional to 765.27, 1,148.18 and 278.37

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Solution

The fourth proportional to 765.27, 1,148.18 and 278.37 is: 417.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.27 : 1,148.18 = 278.37 : x
  2. Step 2: Convert to fraction form
    765.27/1,148.18 = 278.37/x
  3. Step 3: Cross multiply
    765.27x = 1,148.18 × 278.37
  4. Step 4: Simplify right side
    765.27x = 319,617.47
  5. Step 5: Solve for x
    x = 319,617.47/765.27
  6. Step 6: Final answer
    x = 417.65

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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.