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Finding the Fourth Proportional to 121,129.20, 181,693.80 and 87,692.40

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Solution

The fourth proportional to 121,129.20, 181,693.80 and 87,692.40 is: 131,538.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,129.20 : 181,693.80 = 87,692.40 : x
  2. Step 2: Convert to fraction form
    121,129.20/181,693.80 = 87,692.40/x
  3. Step 3: Cross multiply
    121,129.20x = 181,693.80 × 87,692.40
  4. Step 4: Simplify right side
    121,129.20x = 15,933,165,387.12
  5. Step 5: Solve for x
    x = 15,933,165,387.12/121,129.20
  6. Step 6: Final answer
    x = 131,538.60

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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.