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Finding the Fourth Proportional to 921.73, 1,272.00 and 528.75

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Solution

The fourth proportional to 921.73, 1,272.00 and 528.75 is: 729.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.73 : 1,272.00 = 528.75 : x
  2. Step 2: Convert to fraction form
    921.73/1,272.00 = 528.75/x
  3. Step 3: Cross multiply
    921.73x = 1,272.00 × 528.75
  4. Step 4: Simplify right side
    921.73x = 672,569.01
  5. Step 5: Solve for x
    x = 672,569.01/921.73
  6. Step 6: Final answer
    x = 729.68

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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.