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Finding the Fourth Proportional to 72,679.80, 109,019.70 and 60,391.80

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Solution

The fourth proportional to 72,679.80, 109,019.70 and 60,391.80 is: 90,587.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,679.80 : 109,019.70 = 60,391.80 : x
  2. Step 2: Convert to fraction form
    72,679.80/109,019.70 = 60,391.80/x
  3. Step 3: Cross multiply
    72,679.80x = 109,019.70 × 60,391.80
  4. Step 4: Simplify right side
    72,679.80x = 6,583,895,918.46
  5. Step 5: Solve for x
    x = 6,583,895,918.46/72,679.80
  6. Step 6: Final answer
    x = 90,587.70

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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.