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Finding the Fourth Proportional to 21,167.36, 29,210.78 and 12,214.78

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Solution

The fourth proportional to 21,167.36, 29,210.78 and 12,214.78 is: 16,856.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,167.36 : 29,210.78 = 12,214.78 : x
  2. Step 2: Convert to fraction form
    21,167.36/29,210.78 = 12,214.78/x
  3. Step 3: Cross multiply
    21,167.36x = 29,210.78 × 12,214.78
  4. Step 4: Simplify right side
    21,167.36x = 356,803,251.33
  5. Step 5: Solve for x
    x = 356,803,251.33/21,167.36
  6. Step 6: Final answer
    x = 16,856.29

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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.