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Finding the Fourth Proportional to 98,431.80, 147,426.10 and 68,981.11

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Solution

The fourth proportional to 98,431.80, 147,426.10 and 68,981.11 is: 103,316.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,431.80 : 147,426.10 = 68,981.11 : x
  2. Step 2: Convert to fraction form
    98,431.80/147,426.10 = 68,981.11/x
  3. Step 3: Cross multiply
    98,431.80x = 147,426.10 × 68,981.11
  4. Step 4: Simplify right side
    98,431.80x = 10,169,616,020.97
  5. Step 5: Solve for x
    x = 10,169,616,020.97/98,431.80
  6. Step 6: Final answer
    x = 103,316.37

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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.