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Finding the Fourth Proportional to 929.43, 1,393.72 and 280.21

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Solution

The fourth proportional to 929.43, 1,393.72 and 280.21 is: 420.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.43 : 1,393.72 = 280.21 : x
  2. Step 2: Convert to fraction form
    929.43/1,393.72 = 280.21/x
  3. Step 3: Cross multiply
    929.43x = 1,393.72 × 280.21
  4. Step 4: Simplify right side
    929.43x = 390,534.28
  5. Step 5: Solve for x
    x = 390,534.28/929.43
  6. Step 6: Final answer
    x = 420.19

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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.