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Finding the Fourth Proportional to 15,159.70, 20,921.93 and 8,446.42

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Solution

The fourth proportional to 15,159.70, 20,921.93 and 8,446.42 is: 11,656.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.70 : 20,921.93 = 8,446.42 : x
  2. Step 2: Convert to fraction form
    15,159.70/20,921.93 = 8,446.42/x
  3. Step 3: Cross multiply
    15,159.70x = 20,921.93 × 8,446.42
  4. Step 4: Simplify right side
    15,159.70x = 176,715,407.99
  5. Step 5: Solve for x
    x = 176,715,407.99/15,159.70
  6. Step 6: Final answer
    x = 11,656.92

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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.