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Finding the Fourth Proportional to 121,347.20, 182,020.80 and 85,917.80

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Solution

The fourth proportional to 121,347.20, 182,020.80 and 85,917.80 is: 128,876.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,347.20 : 182,020.80 = 85,917.80 : x
  2. Step 2: Convert to fraction form
    121,347.20/182,020.80 = 85,917.80/x
  3. Step 3: Cross multiply
    121,347.20x = 182,020.80 × 85,917.80
  4. Step 4: Simplify right side
    121,347.20x = 15,638,826,690.24
  5. Step 5: Solve for x
    x = 15,638,826,690.24/121,347.20
  6. Step 6: Final answer
    x = 128,876.70

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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.