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Finding the Fourth Proportional to 18,612.80, 25,685.64 and 10,655.20

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Solution

The fourth proportional to 18,612.80, 25,685.64 and 10,655.20 is: 14,704.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,612.80 : 25,685.64 = 10,655.20 : x
  2. Step 2: Convert to fraction form
    18,612.80/25,685.64 = 10,655.20/x
  3. Step 3: Cross multiply
    18,612.80x = 25,685.64 × 10,655.20
  4. Step 4: Simplify right side
    18,612.80x = 273,685,631.33
  5. Step 5: Solve for x
    x = 273,685,631.33/18,612.80
  6. Step 6: Final answer
    x = 14,704.16

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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.