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Finding the Fourth Proportional to 68,422.80, 102,619.80 and 28,981.20

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Solution

The fourth proportional to 68,422.80, 102,619.80 and 28,981.20 is: 43,465.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,422.80 : 102,619.80 = 28,981.20 : x
  2. Step 2: Convert to fraction form
    68,422.80/102,619.80 = 28,981.20/x
  3. Step 3: Cross multiply
    68,422.80x = 102,619.80 × 28,981.20
  4. Step 4: Simplify right side
    68,422.80x = 2,974,044,947.76
  5. Step 5: Solve for x
    x = 2,974,044,947.76/68,422.80
  6. Step 6: Final answer
    x = 43,465.70

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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.