Home / 20,807.48-31,214.31-7,658.90

Finding the Fourth Proportional to 20,807.48, 31,214.31 and 7,658.90

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Solution

The fourth proportional to 20,807.48, 31,214.31 and 7,658.90 is: 11,489.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,807.48 : 31,214.31 = 7,658.90 : x
  2. Step 2: Convert to fraction form
    20,807.48/31,214.31 = 7,658.90/x
  3. Step 3: Cross multiply
    20,807.48x = 31,214.31 × 7,658.90
  4. Step 4: Simplify right side
    20,807.48x = 239,067,278.86
  5. Step 5: Solve for x
    x = 239,067,278.86/20,807.48
  6. Step 6: Final answer
    x = 11,489.49

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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.