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Finding the Fourth Proportional to 765.14, 1,147.34 and 278.12

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Solution

The fourth proportional to 765.14, 1,147.34 and 278.12 is: 417.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.14 : 1,147.34 = 278.12 : x
  2. Step 2: Convert to fraction form
    765.14/1,147.34 = 278.12/x
  3. Step 3: Cross multiply
    765.14x = 1,147.34 × 278.12
  4. Step 4: Simplify right side
    765.14x = 319,101.76
  5. Step 5: Solve for x
    x = 319,101.76/765.14
  6. Step 6: Final answer
    x = 417.05

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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.