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Finding the Fourth Proportional to 72,671.20, 109,021.20 and 61,064.80

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Solution

The fourth proportional to 72,671.20, 109,021.20 and 61,064.80 is: 91,609.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,671.20 : 109,021.20 = 61,064.80 : x
  2. Step 2: Convert to fraction form
    72,671.20/109,021.20 = 61,064.80/x
  3. Step 3: Cross multiply
    72,671.20x = 109,021.20 × 61,064.80
  4. Step 4: Simplify right side
    72,671.20x = 6,657,357,773.76
  5. Step 5: Solve for x
    x = 6,657,357,773.76/72,671.20
  6. Step 6: Final answer
    x = 91,609.30

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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.