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Finding the Fourth Proportional to 18,505.74, 25,531.78 and 10,438.40

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Solution

The fourth proportional to 18,505.74, 25,531.78 and 10,438.40 is: 14,401.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,505.74 : 25,531.78 = 10,438.40 : x
  2. Step 2: Convert to fraction form
    18,505.74/25,531.78 = 10,438.40/x
  3. Step 3: Cross multiply
    18,505.74x = 25,531.78 × 10,438.40
  4. Step 4: Simplify right side
    18,505.74x = 266,510,932.35
  5. Step 5: Solve for x
    x = 266,510,932.35/18,505.74
  6. Step 6: Final answer
    x = 14,401.53

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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.