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Finding the Fourth Proportional to 72,686.80, 109,030.20 and 68,309.20

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Solution

The fourth proportional to 72,686.80, 109,030.20 and 68,309.20 is: 102,463.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,686.80 : 109,030.20 = 68,309.20 : x
  2. Step 2: Convert to fraction form
    72,686.80/109,030.20 = 68,309.20/x
  3. Step 3: Cross multiply
    72,686.80x = 109,030.20 × 68,309.20
  4. Step 4: Simplify right side
    72,686.80x = 7,447,765,737.84
  5. Step 5: Solve for x
    x = 7,447,765,737.84/72,686.80
  6. Step 6: Final answer
    x = 102,463.80

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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.