Home / 80,909.40-121,364.10-78,187.80

Finding the Fourth Proportional to 80,909.40, 121,364.10 and 78,187.80

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Solution

The fourth proportional to 80,909.40, 121,364.10 and 78,187.80 is: 117,281.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,909.40 : 121,364.10 = 78,187.80 : x
  2. Step 2: Convert to fraction form
    80,909.40/121,364.10 = 78,187.80/x
  3. Step 3: Cross multiply
    80,909.40x = 121,364.10 × 78,187.80
  4. Step 4: Simplify right side
    80,909.40x = 9,489,191,977.98
  5. Step 5: Solve for x
    x = 9,489,191,977.98/80,909.40
  6. Step 6: Final answer
    x = 117,281.70

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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.