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Finding the Fourth Proportional to 121,408.80, 182,113.20 and 85,979.40

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Solution

The fourth proportional to 121,408.80, 182,113.20 and 85,979.40 is: 128,969.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,408.80 : 182,113.20 = 85,979.40 : x
  2. Step 2: Convert to fraction form
    121,408.80/182,113.20 = 85,979.40/x
  3. Step 3: Cross multiply
    121,408.80x = 182,113.20 × 85,979.40
  4. Step 4: Simplify right side
    121,408.80x = 15,657,983,668.08
  5. Step 5: Solve for x
    x = 15,657,983,668.08/121,408.80
  6. Step 6: Final answer
    x = 128,969.10

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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.