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Finding the Fourth Proportional to 21,363.73, 29,479.64 and 12,748.32

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Solution

The fourth proportional to 21,363.73, 29,479.64 and 12,748.32 is: 17,591.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,363.73 : 29,479.64 = 12,748.32 : x
  2. Step 2: Convert to fraction form
    21,363.73/29,479.64 = 12,748.32/x
  3. Step 3: Cross multiply
    21,363.73x = 29,479.64 × 12,748.32
  4. Step 4: Simplify right side
    21,363.73x = 375,815,820.46
  5. Step 5: Solve for x
    x = 375,815,820.46/21,363.73
  6. Step 6: Final answer
    x = 17,591.30

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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.