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Finding the Fourth Proportional to 929.87, 1,394.76 and 280.61

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Solution

The fourth proportional to 929.87, 1,394.76 and 280.61 is: 420.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.87 : 1,394.76 = 280.61 : x
  2. Step 2: Convert to fraction form
    929.87/1,394.76 = 280.61/x
  3. Step 3: Cross multiply
    929.87x = 1,394.76 × 280.61
  4. Step 4: Simplify right side
    929.87x = 391,383.60
  5. Step 5: Solve for x
    x = 391,383.60/929.87
  6. Step 6: Final answer
    x = 420.90

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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.