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Finding the Fourth Proportional to 15,159.87, 20,921.76 and 8,788.14

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Solution

The fourth proportional to 15,159.87, 20,921.76 and 8,788.14 is: 12,128.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.87 : 20,921.76 = 8,788.14 : x
  2. Step 2: Convert to fraction form
    15,159.87/20,921.76 = 8,788.14/x
  3. Step 3: Cross multiply
    15,159.87x = 20,921.76 × 8,788.14
  4. Step 4: Simplify right side
    15,159.87x = 183,863,355.93
  5. Step 5: Solve for x
    x = 183,863,355.93/15,159.87
  6. Step 6: Final answer
    x = 12,128.29

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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.