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Finding the Fourth Proportional to 91,102.80, 136,423.80 and 72,670.80

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Solution

The fourth proportional to 91,102.80, 136,423.80 and 72,670.80 is: 108,822.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,102.80 : 136,423.80 = 72,670.80 : x
  2. Step 2: Convert to fraction form
    91,102.80/136,423.80 = 72,670.80/x
  3. Step 3: Cross multiply
    91,102.80x = 136,423.80 × 72,670.80
  4. Step 4: Simplify right side
    91,102.80x = 9,914,026,685.04
  5. Step 5: Solve for x
    x = 9,914,026,685.04/91,102.80
  6. Step 6: Final answer
    x = 108,822.41

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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.