Home / 80,987.10-121,427.85-72,692.70

Finding the Fourth Proportional to 80,987.10, 121,427.85 and 72,692.70

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Solution

The fourth proportional to 80,987.10, 121,427.85 and 72,692.70 is: 108,991.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,987.10 : 121,427.85 = 72,692.70 : x
  2. Step 2: Convert to fraction form
    80,987.10/121,427.85 = 72,692.70/x
  3. Step 3: Cross multiply
    80,987.10x = 121,427.85 × 72,692.70
  4. Step 4: Simplify right side
    80,987.10x = 8,826,918,271.70
  5. Step 5: Solve for x
    x = 8,826,918,271.70/80,987.10
  6. Step 6: Final answer
    x = 108,991.66

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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.