Home / 80,901.82-121,407.40-28,311.76

Finding the Fourth Proportional to 80,901.82, 121,407.40 and 28,311.76

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Solution

The fourth proportional to 80,901.82, 121,407.40 and 28,311.76 is: 42,486.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,901.82 : 121,407.40 = 28,311.76 : x
  2. Step 2: Convert to fraction form
    80,901.82/121,407.40 = 28,311.76/x
  3. Step 3: Cross multiply
    80,901.82x = 121,407.40 × 28,311.76
  4. Step 4: Simplify right side
    80,901.82x = 3,437,257,171.02
  5. Step 5: Solve for x
    x = 3,437,257,171.02/80,901.82
  6. Step 6: Final answer
    x = 42,486.77

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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.