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Finding the Fourth Proportional to 72,672.20, 109,022.70 and 61,065.80

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Solution

The fourth proportional to 72,672.20, 109,022.70 and 61,065.80 is: 91,610.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,672.20 : 109,022.70 = 61,065.80 : x
  2. Step 2: Convert to fraction form
    72,672.20/109,022.70 = 61,065.80/x
  3. Step 3: Cross multiply
    72,672.20x = 109,022.70 × 61,065.80
  4. Step 4: Simplify right side
    72,672.20x = 6,657,558,393.66
  5. Step 5: Solve for x
    x = 6,657,558,393.66/72,672.20
  6. Step 6: Final answer
    x = 91,610.80

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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.