Home / 15,521.49-21,419.64-8,447.90

Finding the Fourth Proportional to 15,521.49, 21,419.64 and 8,447.90

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Solution

The fourth proportional to 15,521.49, 21,419.64 and 8,447.90 is: 11,658.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,521.49 : 21,419.64 = 8,447.90 : x
  2. Step 2: Convert to fraction form
    15,521.49/21,419.64 = 8,447.90/x
  3. Step 3: Cross multiply
    15,521.49x = 21,419.64 × 8,447.90
  4. Step 4: Simplify right side
    15,521.49x = 180,950,869.66
  5. Step 5: Solve for x
    x = 180,950,869.66/15,521.49
  6. Step 6: Final answer
    x = 11,658.09

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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.