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Finding the Fourth Proportional to 18,489.79, 25,515.90 and 9,991.91

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Solution

The fourth proportional to 18,489.79, 25,515.90 and 9,991.91 is: 13,788.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,489.79 : 25,515.90 = 9,991.91 : x
  2. Step 2: Convert to fraction form
    18,489.79/25,515.90 = 9,991.91/x
  3. Step 3: Cross multiply
    18,489.79x = 25,515.90 × 9,991.91
  4. Step 4: Simplify right side
    18,489.79x = 254,952,398.83
  5. Step 5: Solve for x
    x = 254,952,398.83/18,489.79
  6. Step 6: Final answer
    x = 13,788.82

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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.