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Finding the Fourth Proportional to 73,389.78, 109,865.70 and 72,135.90

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Solution

The fourth proportional to 73,389.78, 109,865.70 and 72,135.90 is: 107,988.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,389.78 : 109,865.70 = 72,135.90 : x
  2. Step 2: Convert to fraction form
    73,389.78/109,865.70 = 72,135.90/x
  3. Step 3: Cross multiply
    73,389.78x = 109,865.70 × 72,135.90
  4. Step 4: Simplify right side
    73,389.78x = 7,925,261,148.63
  5. Step 5: Solve for x
    x = 7,925,261,148.63/73,389.78
  6. Step 6: Final answer
    x = 107,988.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.