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Finding the Fourth Proportional to 18,995.31, 28,490.31 and 6,515.13

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Solution

The fourth proportional to 18,995.31, 28,490.31 and 6,515.13 is: 9,771.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,995.31 : 28,490.31 = 6,515.13 : x
  2. Step 2: Convert to fraction form
    18,995.31/28,490.31 = 6,515.13/x
  3. Step 3: Cross multiply
    18,995.31x = 28,490.31 × 6,515.13
  4. Step 4: Simplify right side
    18,995.31x = 185,618,073.39
  5. Step 5: Solve for x
    x = 185,618,073.39/18,995.31
  6. Step 6: Final answer
    x = 9,771.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.