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Finding the Fourth Proportional to 18,381.60, 25,358.40 and 12,411.36

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Solution

The fourth proportional to 18,381.60, 25,358.40 and 12,411.36 is: 17,122.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,381.60 : 25,358.40 = 12,411.36 : x
  2. Step 2: Convert to fraction form
    18,381.60/25,358.40 = 12,411.36/x
  3. Step 3: Cross multiply
    18,381.60x = 25,358.40 × 12,411.36
  4. Step 4: Simplify right side
    18,381.60x = 314,732,231.42
  5. Step 5: Solve for x
    x = 314,732,231.42/18,381.60
  6. Step 6: Final answer
    x = 17,122.13

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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.