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Finding the Fourth Proportional to 9,921.61, 13,691.78 and 5,445.44

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Solution

The fourth proportional to 9,921.61, 13,691.78 and 5,445.44 is: 7,514.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,921.61 : 13,691.78 = 5,445.44 : x
  2. Step 2: Convert to fraction form
    9,921.61/13,691.78 = 5,445.44/x
  3. Step 3: Cross multiply
    9,921.61x = 13,691.78 × 5,445.44
  4. Step 4: Simplify right side
    9,921.61x = 74,557,670.80
  5. Step 5: Solve for x
    x = 74,557,670.80/9,921.61
  6. Step 6: Final answer
    x = 7,514.68

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1.5x scale

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.