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Finding the Fourth Proportional to 15,159.70, 20,921.02 and 8,445.33

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Solution

The fourth proportional to 15,159.70, 20,921.02 and 8,445.33 is: 11,654.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,159.70 : 20,921.02 = 8,445.33 : x
  2. Step 2: Convert to fraction form
    15,159.70/20,921.02 = 8,445.33/x
  3. Step 3: Cross multiply
    15,159.70x = 20,921.02 × 8,445.33
  4. Step 4: Simplify right side
    15,159.70x = 176,684,917.84
  5. Step 5: Solve for x
    x = 176,684,917.84/15,159.70
  6. Step 6: Final answer
    x = 11,654.91

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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.