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Finding the Fourth Proportional to 103,426.80, 155,176.65 and 99,781.80

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Solution

The fourth proportional to 103,426.80, 155,176.65 and 99,781.80 is: 149,707.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,426.80 : 155,176.65 = 99,781.80 : x
  2. Step 2: Convert to fraction form
    103,426.80/155,176.65 = 99,781.80/x
  3. Step 3: Cross multiply
    103,426.80x = 155,176.65 × 99,781.80
  4. Step 4: Simplify right side
    103,426.80x = 15,483,805,454.97
  5. Step 5: Solve for x
    x = 15,483,805,454.97/103,426.80
  6. Step 6: Final answer
    x = 149,707.87

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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.