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Finding the Fourth Proportional to 15,521.01, 21,418.88 and 8,447.46

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Solution

The fourth proportional to 15,521.01, 21,418.88 and 8,447.46 is: 11,657.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,521.01 : 21,418.88 = 8,447.46 : x
  2. Step 2: Convert to fraction form
    15,521.01/21,418.88 = 8,447.46/x
  3. Step 3: Cross multiply
    15,521.01x = 21,418.88 × 8,447.46
  4. Step 4: Simplify right side
    15,521.01x = 180,935,089.81
  5. Step 5: Solve for x
    x = 180,935,089.81/15,521.01
  6. Step 6: Final answer
    x = 11,657.43

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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.