Home / 20,855.12-31,281.60-5,272.88

Finding the Fourth Proportional to 20,855.12, 31,281.60 and 5,272.88

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Solution

The fourth proportional to 20,855.12, 31,281.60 and 5,272.88 is: 7,909.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.12 : 31,281.60 = 5,272.88 : x
  2. Step 2: Convert to fraction form
    20,855.12/31,281.60 = 5,272.88/x
  3. Step 3: Cross multiply
    20,855.12x = 31,281.60 × 5,272.88
  4. Step 4: Simplify right side
    20,855.12x = 164,944,123.01
  5. Step 5: Solve for x
    x = 164,944,123.01/20,855.12
  6. Step 6: Final answer
    x = 7,909.05

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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.