Home / 20,665.47-31,001.69-8,178.91

Finding the Fourth Proportional to 20,665.47, 31,001.69 and 8,178.91

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Solution

The fourth proportional to 20,665.47, 31,001.69 and 8,178.91 is: 12,269.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,665.47 : 31,001.69 = 8,178.91 : x
  2. Step 2: Convert to fraction form
    20,665.47/31,001.69 = 8,178.91/x
  3. Step 3: Cross multiply
    20,665.47x = 31,001.69 × 8,178.91
  4. Step 4: Simplify right side
    20,665.47x = 253,560,032.36
  5. Step 5: Solve for x
    x = 253,560,032.36/20,665.47
  6. Step 6: Final answer
    x = 12,269.74

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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.