Home / 20,547.28-28,355.30-11,115.84

Finding the Fourth Proportional to 20,547.28, 28,355.30 and 11,115.84

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Solution

The fourth proportional to 20,547.28, 28,355.30 and 11,115.84 is: 15,339.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,547.28 : 28,355.30 = 11,115.84 : x
  2. Step 2: Convert to fraction form
    20,547.28/28,355.30 = 11,115.84/x
  3. Step 3: Cross multiply
    20,547.28x = 28,355.30 × 11,115.84
  4. Step 4: Simplify right side
    20,547.28x = 315,192,977.95
  5. Step 5: Solve for x
    x = 315,192,977.95/20,547.28
  6. Step 6: Final answer
    x = 15,339.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.