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Finding the Fourth Proportional to 80,989.80, 121,484.70 and 51,538.20

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Solution

The fourth proportional to 80,989.80, 121,484.70 and 51,538.20 is: 77,307.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,989.80 : 121,484.70 = 51,538.20 : x
  2. Step 2: Convert to fraction form
    80,989.80/121,484.70 = 51,538.20/x
  3. Step 3: Cross multiply
    80,989.80x = 121,484.70 × 51,538.20
  4. Step 4: Simplify right side
    80,989.80x = 6,261,102,765.54
  5. Step 5: Solve for x
    x = 6,261,102,765.54/80,989.80
  6. Step 6: Final answer
    x = 77,307.30

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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.