Home / 20,272.40-30,381.12-7,780.88

Finding the Fourth Proportional to 20,272.40, 30,381.12 and 7,780.88

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Solution

The fourth proportional to 20,272.40, 30,381.12 and 7,780.88 is: 11,660.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,272.40 : 30,381.12 = 7,780.88 : x
  2. Step 2: Convert to fraction form
    20,272.40/30,381.12 = 7,780.88/x
  3. Step 3: Cross multiply
    20,272.40x = 30,381.12 × 7,780.88
  4. Step 4: Simplify right side
    20,272.40x = 236,391,848.99
  5. Step 5: Solve for x
    x = 236,391,848.99/20,272.40
  6. Step 6: Final answer
    x = 11,660.77

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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.