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Finding the Fourth Proportional to 15,438.56, 21,305.28 and 8,364.99

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Solution

The fourth proportional to 15,438.56, 21,305.28 and 8,364.99 is: 11,543.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,438.56 : 21,305.28 = 8,364.99 : x
  2. Step 2: Convert to fraction form
    15,438.56/21,305.28 = 8,364.99/x
  3. Step 3: Cross multiply
    15,438.56x = 21,305.28 × 8,364.99
  4. Step 4: Simplify right side
    15,438.56x = 178,218,454.15
  5. Step 5: Solve for x
    x = 178,218,454.15/15,438.56
  6. Step 6: Final answer
    x = 11,543.73

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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.