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Finding the Fourth Proportional to 15,165.64, 20,928.50 and 8,451.56

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Solution

The fourth proportional to 15,165.64, 20,928.50 and 8,451.56 is: 11,663.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,165.64 : 20,928.50 = 8,451.56 : x
  2. Step 2: Convert to fraction form
    15,165.64/20,928.50 = 8,451.56/x
  3. Step 3: Cross multiply
    15,165.64x = 20,928.50 × 8,451.56
  4. Step 4: Simplify right side
    15,165.64x = 176,878,473.46
  5. Step 5: Solve for x
    x = 176,878,473.46/15,165.64
  6. Step 6: Final answer
    x = 11,663.11

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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.