Home / 31,686.98-43,715.57-20,354.90

Finding the Fourth Proportional to 31,686.98, 43,715.57 and 20,354.90

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Solution

The fourth proportional to 31,686.98, 43,715.57 and 20,354.90 is: 28,081.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,686.98 : 43,715.57 = 20,354.90 : x
  2. Step 2: Convert to fraction form
    31,686.98/43,715.57 = 20,354.90/x
  3. Step 3: Cross multiply
    31,686.98x = 43,715.57 × 20,354.90
  4. Step 4: Simplify right side
    31,686.98x = 889,825,735.44
  5. Step 5: Solve for x
    x = 889,825,735.44/31,686.98
  6. Step 6: Final answer
    x = 28,081.75

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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.