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Finding the Fourth Proportional to 72,699.20, 109,063.20 and 61,092.80

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Solution

The fourth proportional to 72,699.20, 109,063.20 and 61,092.80 is: 91,651.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,699.20 : 109,063.20 = 61,092.80 : x
  2. Step 2: Convert to fraction form
    72,699.20/109,063.20 = 61,092.80/x
  3. Step 3: Cross multiply
    72,699.20x = 109,063.20 × 61,092.80
  4. Step 4: Simplify right side
    72,699.20x = 6,662,976,264.96
  5. Step 5: Solve for x
    x = 6,662,976,264.96/72,699.20
  6. Step 6: Final answer
    x = 91,651.30

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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.