Home / 20,971.28-31,448.80-8,488.12

Finding the Fourth Proportional to 20,971.28, 31,448.80 and 8,488.12

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Solution

The fourth proportional to 20,971.28, 31,448.80 and 8,488.12 is: 12,728.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.28 : 31,448.80 = 8,488.12 : x
  2. Step 2: Convert to fraction form
    20,971.28/31,448.80 = 8,488.12/x
  3. Step 3: Cross multiply
    20,971.28x = 31,448.80 × 8,488.12
  4. Step 4: Simplify right side
    20,971.28x = 266,941,188.26
  5. Step 5: Solve for x
    x = 266,941,188.26/20,971.28
  6. Step 6: Final answer
    x = 12,728.89

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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.