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Finding the Fourth Proportional to 15,639.20, 21,581.88 and 8,565.20

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Solution

The fourth proportional to 15,639.20, 21,581.88 and 8,565.20 is: 11,819.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,639.20 : 21,581.88 = 8,565.20 : x
  2. Step 2: Convert to fraction form
    15,639.20/21,581.88 = 8,565.20/x
  3. Step 3: Cross multiply
    15,639.20x = 21,581.88 × 8,565.20
  4. Step 4: Simplify right side
    15,639.20x = 184,853,118.58
  5. Step 5: Solve for x
    x = 184,853,118.58/15,639.20
  6. Step 6: Final answer
    x = 11,819.86

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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.