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Finding the Fourth Proportional to 15,909.92, 21,963.92 and 11,215.16

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Solution

The fourth proportional to 15,909.92, 21,963.92 and 11,215.16 is: 15,482.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,909.92 : 21,963.92 = 11,215.16 : x
  2. Step 2: Convert to fraction form
    15,909.92/21,963.92 = 11,215.16/x
  3. Step 3: Cross multiply
    15,909.92x = 21,963.92 × 11,215.16
  4. Step 4: Simplify right side
    15,909.92x = 246,328,877.03
  5. Step 5: Solve for x
    x = 246,328,877.03/15,909.92
  6. Step 6: Final answer
    x = 15,482.72

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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.