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Finding the Fourth Proportional to 765.60, 1,148.32 and 278.56

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Solution

The fourth proportional to 765.60, 1,148.32 and 278.56 is: 417.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.60 : 1,148.32 = 278.56 : x
  2. Step 2: Convert to fraction form
    765.60/1,148.32 = 278.56/x
  3. Step 3: Cross multiply
    765.60x = 1,148.32 × 278.56
  4. Step 4: Simplify right side
    765.60x = 319,876.02
  5. Step 5: Solve for x
    x = 319,876.02/765.60
  6. Step 6: Final answer
    x = 417.81

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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.