Home / 20,781.56-31,182.77-9,689.12

Finding the Fourth Proportional to 20,781.56, 31,182.77 and 9,689.12

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Solution

The fourth proportional to 20,781.56, 31,182.77 and 9,689.12 is: 14,538.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.56 : 31,182.77 = 9,689.12 : x
  2. Step 2: Convert to fraction form
    20,781.56/31,182.77 = 9,689.12/x
  3. Step 3: Cross multiply
    20,781.56x = 31,182.77 × 9,689.12
  4. Step 4: Simplify right side
    20,781.56x = 302,133,396.10
  5. Step 5: Solve for x
    x = 302,133,396.10/20,781.56
  6. Step 6: Final answer
    x = 14,538.54

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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.