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Finding the Fourth Proportional to 99,730.89, 137,628.43 and 54,408.87

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Solution

The fourth proportional to 99,730.89, 137,628.43 and 54,408.87 is: 75,084.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,730.89 : 137,628.43 = 54,408.87 : x
  2. Step 2: Convert to fraction form
    99,730.89/137,628.43 = 54,408.87/x
  3. Step 3: Cross multiply
    99,730.89x = 137,628.43 × 54,408.87
  4. Step 4: Simplify right side
    99,730.89x = 7,488,207,220.15
  5. Step 5: Solve for x
    x = 7,488,207,220.15/99,730.89
  6. Step 6: Final answer
    x = 75,084.13

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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.