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Finding the Fourth Proportional to 765.42, 1,148.74 and 278.62

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Solution

The fourth proportional to 765.42, 1,148.74 and 278.62 is: 418.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.42 : 1,148.74 = 278.62 : x
  2. Step 2: Convert to fraction form
    765.42/1,148.74 = 278.62/x
  3. Step 3: Cross multiply
    765.42x = 1,148.74 × 278.62
  4. Step 4: Simplify right side
    765.42x = 320,061.94
  5. Step 5: Solve for x
    x = 320,061.94/765.42
  6. Step 6: Final answer
    x = 418.15

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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.