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Finding the Fourth Proportional to 72,004.20, 108,006.30 and 61,981.80

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Solution

The fourth proportional to 72,004.20, 108,006.30 and 61,981.80 is: 92,972.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,004.20 : 108,006.30 = 61,981.80 : x
  2. Step 2: Convert to fraction form
    72,004.20/108,006.30 = 61,981.80/x
  3. Step 3: Cross multiply
    72,004.20x = 108,006.30 × 61,981.80
  4. Step 4: Simplify right side
    72,004.20x = 6,694,424,885.34
  5. Step 5: Solve for x
    x = 6,694,424,885.34/72,004.20
  6. Step 6: Final answer
    x = 92,972.70

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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.