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Finding the Fourth Proportional to 21,899.15, 30,221.04 and 12,468.32

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Solution

The fourth proportional to 21,899.15, 30,221.04 and 12,468.32 is: 17,206.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,899.15 : 30,221.04 = 12,468.32 : x
  2. Step 2: Convert to fraction form
    21,899.15/30,221.04 = 12,468.32/x
  3. Step 3: Cross multiply
    21,899.15x = 30,221.04 × 12,468.32
  4. Step 4: Simplify right side
    21,899.15x = 376,805,446.35
  5. Step 5: Solve for x
    x = 376,805,446.35/21,899.15
  6. Step 6: Final answer
    x = 17,206.40

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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.