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Finding the Fourth Proportional to 18,391.74, 25,373.76 and 11,219.18

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Solution

The fourth proportional to 18,391.74, 25,373.76 and 11,219.18 is: 15,478.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,391.74 : 25,373.76 = 11,219.18 : x
  2. Step 2: Convert to fraction form
    18,391.74/25,373.76 = 11,219.18/x
  3. Step 3: Cross multiply
    18,391.74x = 25,373.76 × 11,219.18
  4. Step 4: Simplify right side
    18,391.74x = 284,672,780.72
  5. Step 5: Solve for x
    x = 284,672,780.72/18,391.74
  6. Step 6: Final answer
    x = 15,478.30

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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.