Home / 80,031.12-120,067.95-66,631.50

Finding the Fourth Proportional to 80,031.12, 120,067.95 and 66,631.50

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Solution

The fourth proportional to 80,031.12, 120,067.95 and 66,631.50 is: 99,964.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,031.12 : 120,067.95 = 66,631.50 : x
  2. Step 2: Convert to fraction form
    80,031.12/120,067.95 = 66,631.50/x
  3. Step 3: Cross multiply
    80,031.12x = 120,067.95 × 66,631.50
  4. Step 4: Simplify right side
    80,031.12x = 8,000,307,610.43
  5. Step 5: Solve for x
    x = 8,000,307,610.43/80,031.12
  6. Step 6: Final answer
    x = 99,964.96

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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.