Home / 15,521.38-21,419.70-8,447.80

Finding the Fourth Proportional to 15,521.38, 21,419.70 and 8,447.80

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Solution

The fourth proportional to 15,521.38, 21,419.70 and 8,447.80 is: 11,658.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,521.38 : 21,419.70 = 8,447.80 : x
  2. Step 2: Convert to fraction form
    15,521.38/21,419.70 = 8,447.80/x
  3. Step 3: Cross multiply
    15,521.38x = 21,419.70 × 8,447.80
  4. Step 4: Simplify right side
    15,521.38x = 180,949,341.66
  5. Step 5: Solve for x
    x = 180,949,341.66/15,521.38
  6. Step 6: Final answer
    x = 11,658.07

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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.