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Finding the Fourth Proportional to 99,309.72, 137,048.30 and 53,987.79

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Solution

The fourth proportional to 99,309.72, 137,048.30 and 53,987.79 is: 74,503.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,309.72 : 137,048.30 = 53,987.79 : x
  2. Step 2: Convert to fraction form
    99,309.72/137,048.30 = 53,987.79/x
  3. Step 3: Cross multiply
    99,309.72x = 137,048.30 × 53,987.79
  4. Step 4: Simplify right side
    99,309.72x = 7,398,935,204.94
  5. Step 5: Solve for x
    x = 7,398,935,204.94/99,309.72
  6. Step 6: Final answer
    x = 74,503.64

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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.