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Finding the Fourth Proportional to 929.94, 1,394.72 and 280.56

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Solution

The fourth proportional to 929.94, 1,394.72 and 280.56 is: 420.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.94 : 1,394.72 = 280.56 : x
  2. Step 2: Convert to fraction form
    929.94/1,394.72 = 280.56/x
  3. Step 3: Cross multiply
    929.94x = 1,394.72 × 280.56
  4. Step 4: Simplify right side
    929.94x = 391,302.64
  5. Step 5: Solve for x
    x = 391,302.64/929.94
  6. Step 6: Final answer
    x = 420.78

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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.