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Finding the Fourth Proportional to 15,873.60, 21,905.79 and 8,704.20

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Solution

The fourth proportional to 15,873.60, 21,905.79 and 8,704.20 is: 12,011.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,873.60 : 21,905.79 = 8,704.20 : x
  2. Step 2: Convert to fraction form
    15,873.60/21,905.79 = 8,704.20/x
  3. Step 3: Cross multiply
    15,873.60x = 21,905.79 × 8,704.20
  4. Step 4: Simplify right side
    15,873.60x = 190,672,377.32
  5. Step 5: Solve for x
    x = 190,672,377.32/15,873.60
  6. Step 6: Final answer
    x = 12,011.92

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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.