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Finding the Fourth Proportional to 1,128.23, 1,691.76 and 511.64

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Solution

The fourth proportional to 1,128.23, 1,691.76 and 511.64 is: 767.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.23 : 1,691.76 = 511.64 : x
  2. Step 2: Convert to fraction form
    1,128.23/1,691.76 = 511.64/x
  3. Step 3: Cross multiply
    1,128.23x = 1,691.76 × 511.64
  4. Step 4: Simplify right side
    1,128.23x = 865,572.09
  5. Step 5: Solve for x
    x = 865,572.09/1,128.23
  6. Step 6: Final answer
    x = 767.19

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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.