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Finding the Fourth Proportional to 18,617.92, 25,706.32 and 12,943.20

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Solution

The fourth proportional to 18,617.92, 25,706.32 and 12,943.20 is: 17,871.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,617.92 : 25,706.32 = 12,943.20 : x
  2. Step 2: Convert to fraction form
    18,617.92/25,706.32 = 12,943.20/x
  3. Step 3: Cross multiply
    18,617.92x = 25,706.32 × 12,943.20
  4. Step 4: Simplify right side
    18,617.92x = 332,722,041.02
  5. Step 5: Solve for x
    x = 332,722,041.02/18,617.92
  6. Step 6: Final answer
    x = 17,871.06

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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.