Home / 13,931.40-20,882.70-7,681.80

Finding the Fourth Proportional to 13,931.40, 20,882.70 and 7,681.80

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Solution

The fourth proportional to 13,931.40, 20,882.70 and 7,681.80 is: 11,514.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,931.40 : 20,882.70 = 7,681.80 : x
  2. Step 2: Convert to fraction form
    13,931.40/20,882.70 = 7,681.80/x
  3. Step 3: Cross multiply
    13,931.40x = 20,882.70 × 7,681.80
  4. Step 4: Simplify right side
    13,931.40x = 160,416,724.86
  5. Step 5: Solve for x
    x = 160,416,724.86/13,931.40
  6. Step 6: Final answer
    x = 11,514.76

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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.