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Finding the Fourth Proportional to 18,367.89, 25,349.85 and 10,915.89

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Solution

The fourth proportional to 18,367.89, 25,349.85 and 10,915.89 is: 15,065.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,367.89 : 25,349.85 = 10,915.89 : x
  2. Step 2: Convert to fraction form
    18,367.89/25,349.85 = 10,915.89/x
  3. Step 3: Cross multiply
    18,367.89x = 25,349.85 × 10,915.89
  4. Step 4: Simplify right side
    18,367.89x = 276,716,174.12
  5. Step 5: Solve for x
    x = 276,716,174.12/18,367.89
  6. Step 6: Final answer
    x = 15,065.21

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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.