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Finding the Fourth Proportional to 1,117.88, 1,542.28 and 645.76

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Solution

The fourth proportional to 1,117.88, 1,542.28 and 645.76 is: 890.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.88 : 1,542.28 = 645.76 : x
  2. Step 2: Convert to fraction form
    1,117.88/1,542.28 = 645.76/x
  3. Step 3: Cross multiply
    1,117.88x = 1,542.28 × 645.76
  4. Step 4: Simplify right side
    1,117.88x = 995,938.10
  5. Step 5: Solve for x
    x = 995,938.10/1,117.88
  6. Step 6: Final answer
    x = 890.92

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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.