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Finding the Fourth Proportional to 15,521.22, 21,424.08 and 8,811.30

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Solution

The fourth proportional to 15,521.22, 21,424.08 and 8,811.30 is: 12,162.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,521.22 : 21,424.08 = 8,811.30 : x
  2. Step 2: Convert to fraction form
    15,521.22/21,424.08 = 8,811.30/x
  3. Step 3: Cross multiply
    15,521.22x = 21,424.08 × 8,811.30
  4. Step 4: Simplify right side
    15,521.22x = 188,773,996.10
  5. Step 5: Solve for x
    x = 188,773,996.10/15,521.22
  6. Step 6: Final answer
    x = 12,162.32

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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.