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Finding the Fourth Proportional to 80,938.60, 121,407.90 and 80,420.20

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Solution

The fourth proportional to 80,938.60, 121,407.90 and 80,420.20 is: 120,630.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,938.60 : 121,407.90 = 80,420.20 : x
  2. Step 2: Convert to fraction form
    80,938.60/121,407.90 = 80,420.20/x
  3. Step 3: Cross multiply
    80,938.60x = 121,407.90 × 80,420.20
  4. Step 4: Simplify right side
    80,938.60x = 9,763,647,599.58
  5. Step 5: Solve for x
    x = 9,763,647,599.58/80,938.60
  6. Step 6: Final answer
    x = 120,630.30

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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.