Home / 20,921.42-31,345.20-11,038.91

Finding the Fourth Proportional to 20,921.42, 31,345.20 and 11,038.91

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Solution

The fourth proportional to 20,921.42, 31,345.20 and 11,038.91 is: 16,538.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.42 : 31,345.20 = 11,038.91 : x
  2. Step 2: Convert to fraction form
    20,921.42/31,345.20 = 11,038.91/x
  3. Step 3: Cross multiply
    20,921.42x = 31,345.20 × 11,038.91
  4. Step 4: Simplify right side
    20,921.42x = 346,016,685.01
  5. Step 5: Solve for x
    x = 346,016,685.01/20,921.42
  6. Step 6: Final answer
    x = 16,538.87

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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.