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Finding the Fourth Proportional to 99,306.70, 137,045.91 and 53,987.72

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Solution

The fourth proportional to 99,306.70, 137,045.91 and 53,987.72 is: 74,504.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,306.70 : 137,045.91 = 53,987.72 : x
  2. Step 2: Convert to fraction form
    99,306.70/137,045.91 = 53,987.72/x
  3. Step 3: Cross multiply
    99,306.70x = 137,045.91 × 53,987.72
  4. Step 4: Simplify right side
    99,306.70x = 7,398,796,216.23
  5. Step 5: Solve for x
    x = 7,398,796,216.23/99,306.70
  6. Step 6: Final answer
    x = 74,504.50

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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.