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Finding the Fourth Proportional to 120,781.20, 181,171.80 and 109,894.80

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Solution

The fourth proportional to 120,781.20, 181,171.80 and 109,894.80 is: 164,842.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,781.20 : 181,171.80 = 109,894.80 : x
  2. Step 2: Convert to fraction form
    120,781.20/181,171.80 = 109,894.80/x
  3. Step 3: Cross multiply
    120,781.20x = 181,171.80 × 109,894.80
  4. Step 4: Simplify right side
    120,781.20x = 19,909,838,726.64
  5. Step 5: Solve for x
    x = 19,909,838,726.64/120,781.20
  6. Step 6: Final answer
    x = 164,842.20

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1.5x scale

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.