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Finding the Fourth Proportional to 929.85, 1,394.97 and 280.53

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Solution

The fourth proportional to 929.85, 1,394.97 and 280.53 is: 420.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.85 : 1,394.97 = 280.53 : x
  2. Step 2: Convert to fraction form
    929.85/1,394.97 = 280.53/x
  3. Step 3: Cross multiply
    929.85x = 1,394.97 × 280.53
  4. Step 4: Simplify right side
    929.85x = 391,330.93
  5. Step 5: Solve for x
    x = 391,330.93/929.85
  6. Step 6: Final answer
    x = 420.85

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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.