Home / 15,521.31-21,419.41-8,447.79

Finding the Fourth Proportional to 15,521.31, 21,419.41 and 8,447.79

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Solution

The fourth proportional to 15,521.31, 21,419.41 and 8,447.79 is: 11,657.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,521.31 : 21,419.41 = 8,447.79 : x
  2. Step 2: Convert to fraction form
    15,521.31/21,419.41 = 8,447.79/x
  3. Step 3: Cross multiply
    15,521.31x = 21,419.41 × 8,447.79
  4. Step 4: Simplify right side
    15,521.31x = 180,946,591.63
  5. Step 5: Solve for x
    x = 180,946,591.63/15,521.31
  6. Step 6: Final answer
    x = 11,657.94

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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.