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Finding the Fourth Proportional to 80,939.40, 121,409.10 and 72,410.10

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Solution

The fourth proportional to 80,939.40, 121,409.10 and 72,410.10 is: 108,615.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,939.40 : 121,409.10 = 72,410.10 : x
  2. Step 2: Convert to fraction form
    80,939.40/121,409.10 = 72,410.10/x
  3. Step 3: Cross multiply
    80,939.40x = 121,409.10 × 72,410.10
  4. Step 4: Simplify right side
    80,939.40x = 8,791,245,071.91
  5. Step 5: Solve for x
    x = 8,791,245,071.91/80,939.40
  6. Step 6: Final answer
    x = 108,615.15

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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.