Home / 31,385.80-43,309.65-18,638.02

Finding the Fourth Proportional to 31,385.80, 43,309.65 and 18,638.02

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Solution

The fourth proportional to 31,385.80, 43,309.65 and 18,638.02 is: 25,718.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,385.80 : 43,309.65 = 18,638.02 : x
  2. Step 2: Convert to fraction form
    31,385.80/43,309.65 = 18,638.02/x
  3. Step 3: Cross multiply
    31,385.80x = 43,309.65 × 18,638.02
  4. Step 4: Simplify right side
    31,385.80x = 807,206,122.89
  5. Step 5: Solve for x
    x = 807,206,122.89/31,385.80
  6. Step 6: Final answer
    x = 25,718.83

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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.