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Finding the Fourth Proportional to 80,999.20, 121,409.70 and 28,381.60

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Solution

The fourth proportional to 80,999.20, 121,409.70 and 28,381.60 is: 42,541.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,999.20 : 121,409.70 = 28,381.60 : x
  2. Step 2: Convert to fraction form
    80,999.20/121,409.70 = 28,381.60/x
  3. Step 3: Cross multiply
    80,999.20x = 121,409.70 × 28,381.60
  4. Step 4: Simplify right side
    80,999.20x = 3,445,801,541.52
  5. Step 5: Solve for x
    x = 3,445,801,541.52/80,999.20
  6. Step 6: Final answer
    x = 42,541.18

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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.