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Finding the Fourth Proportional to 80,886.80, 121,330.20 and 45,457.40

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Solution

The fourth proportional to 80,886.80, 121,330.20 and 45,457.40 is: 68,186.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,886.80 : 121,330.20 = 45,457.40 : x
  2. Step 2: Convert to fraction form
    80,886.80/121,330.20 = 45,457.40/x
  3. Step 3: Cross multiply
    80,886.80x = 121,330.20 × 45,457.40
  4. Step 4: Simplify right side
    80,886.80x = 5,515,355,433.48
  5. Step 5: Solve for x
    x = 5,515,355,433.48/80,886.80
  6. Step 6: Final answer
    x = 68,186.10

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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.