Home / 20,471.57-30,689.10-7,988.69

Finding the Fourth Proportional to 20,471.57, 30,689.10 and 7,988.69

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Solution

The fourth proportional to 20,471.57, 30,689.10 and 7,988.69 is: 11,975.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,471.57 : 30,689.10 = 7,988.69 : x
  2. Step 2: Convert to fraction form
    20,471.57/30,689.10 = 7,988.69/x
  3. Step 3: Cross multiply
    20,471.57x = 30,689.10 × 7,988.69
  4. Step 4: Simplify right side
    20,471.57x = 245,165,666.34
  5. Step 5: Solve for x
    x = 245,165,666.34/20,471.57
  6. Step 6: Final answer
    x = 11,975.91

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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.