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Finding the Fourth Proportional to 921.81, 1,272.17 and 528.90

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Solution

The fourth proportional to 921.81, 1,272.17 and 528.90 is: 729.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.81 : 1,272.17 = 528.90 : x
  2. Step 2: Convert to fraction form
    921.81/1,272.17 = 528.90/x
  3. Step 3: Cross multiply
    921.81x = 1,272.17 × 528.90
  4. Step 4: Simplify right side
    921.81x = 672,850.71
  5. Step 5: Solve for x
    x = 672,850.71/921.81
  6. Step 6: Final answer
    x = 729.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.