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Finding the Fourth Proportional to 99,043.74, 136,679.13 and 53,721

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Solution

The fourth proportional to 99,043.74, 136,679.13 and 53,721 is: 74,134.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,043.74 : 136,679.13 = 53,721 : x
  2. Step 2: Convert to fraction form
    99,043.74/136,679.13 = 53,721/x
  3. Step 3: Cross multiply
    99,043.74x = 136,679.13 × 53,721
  4. Step 4: Simplify right side
    99,043.74x = 7,342,539,542.73
  5. Step 5: Solve for x
    x = 7,342,539,542.73/99,043.74
  6. Step 6: Final answer
    x = 74,134.31

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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.