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Finding the Fourth Proportional to 21,648.96, 29,874.96 and 12,218.40

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Solution

The fourth proportional to 21,648.96, 29,874.96 and 12,218.40 is: 16,861.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,648.96 : 29,874.96 = 12,218.40 : x
  2. Step 2: Convert to fraction form
    21,648.96/29,874.96 = 12,218.40/x
  3. Step 3: Cross multiply
    21,648.96x = 29,874.96 × 12,218.40
  4. Step 4: Simplify right side
    21,648.96x = 365,024,211.26
  5. Step 5: Solve for x
    x = 365,024,211.26/21,648.96
  6. Step 6: Final answer
    x = 16,861.05

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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.