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Finding the Fourth Proportional to 20,478.72, 30,718.08 and 5,687.64

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Solution

The fourth proportional to 20,478.72, 30,718.08 and 5,687.64 is: 8,531.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.72 : 30,718.08 = 5,687.64 : x
  2. Step 2: Convert to fraction form
    20,478.72/30,718.08 = 5,687.64/x
  3. Step 3: Cross multiply
    20,478.72x = 30,718.08 × 5,687.64
  4. Step 4: Simplify right side
    20,478.72x = 174,713,380.53
  5. Step 5: Solve for x
    x = 174,713,380.53/20,478.72
  6. Step 6: Final answer
    x = 8,531.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.