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Finding the Fourth Proportional to 921.69, 1,272.11 and 528.71

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Solution

The fourth proportional to 921.69, 1,272.11 and 528.71 is: 729.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.69 : 1,272.11 = 528.71 : x
  2. Step 2: Convert to fraction form
    921.69/1,272.11 = 528.71/x
  3. Step 3: Cross multiply
    921.69x = 1,272.11 × 528.71
  4. Step 4: Simplify right side
    921.69x = 672,568.27
  5. Step 5: Solve for x
    x = 672,568.27/921.69
  6. Step 6: Final answer
    x = 729.71

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Double scale
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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.