Home / 31,120.20-42,945.12-16,972.56

Finding the Fourth Proportional to 31,120.20, 42,945.12 and 16,972.56

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Solution

The fourth proportional to 31,120.20, 42,945.12 and 16,972.56 is: 23,421.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,120.20 : 42,945.12 = 16,972.56 : x
  2. Step 2: Convert to fraction form
    31,120.20/42,945.12 = 16,972.56/x
  3. Step 3: Cross multiply
    31,120.20x = 42,945.12 × 16,972.56
  4. Step 4: Simplify right side
    31,120.20x = 728,888,625.91
  5. Step 5: Solve for x
    x = 728,888,625.91/31,120.20
  6. Step 6: Final answer
    x = 23,421.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.