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Finding the Fourth Proportional to 103,621.60, 155,470.80 and 99,781.60

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Solution

The fourth proportional to 103,621.60, 155,470.80 and 99,781.60 is: 149,709.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,621.60 : 155,470.80 = 99,781.60 : x
  2. Step 2: Convert to fraction form
    103,621.60/155,470.80 = 99,781.60/x
  3. Step 3: Cross multiply
    103,621.60x = 155,470.80 × 99,781.60
  4. Step 4: Simplify right side
    103,621.60x = 15,513,125,177.28
  5. Step 5: Solve for x
    x = 15,513,125,177.28/103,621.60
  6. Step 6: Final answer
    x = 149,709.38

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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.