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Finding the Fourth Proportional to 15,521.61, 21,419.19 and 8,807.10

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Solution

The fourth proportional to 15,521.61, 21,419.19 and 8,807.10 is: 12,153.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,521.61 : 21,419.19 = 8,807.10 : x
  2. Step 2: Convert to fraction form
    15,521.61/21,419.19 = 8,807.10/x
  3. Step 3: Cross multiply
    15,521.61x = 21,419.19 × 8,807.10
  4. Step 4: Simplify right side
    15,521.61x = 188,640,843.16
  5. Step 5: Solve for x
    x = 188,640,843.16/15,521.61
  6. Step 6: Final answer
    x = 12,153.43

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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.