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Finding the Fourth Proportional to 1,117.78, 1,676.68 and 424.26

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Solution

The fourth proportional to 1,117.78, 1,676.68 and 424.26 is: 636.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.78 : 1,676.68 = 424.26 : x
  2. Step 2: Convert to fraction form
    1,117.78/1,676.68 = 424.26/x
  3. Step 3: Cross multiply
    1,117.78x = 1,676.68 × 424.26
  4. Step 4: Simplify right side
    1,117.78x = 711,348.26
  5. Step 5: Solve for x
    x = 711,348.26/1,117.78
  6. Step 6: Final answer
    x = 636.39

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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.