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Finding the Fourth Proportional to 21,600.78, 29,809.38 and 12,040.40

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Solution

The fourth proportional to 21,600.78, 29,809.38 and 12,040.40 is: 16,615.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,600.78 : 29,809.38 = 12,040.40 : x
  2. Step 2: Convert to fraction form
    21,600.78/29,809.38 = 12,040.40/x
  3. Step 3: Cross multiply
    21,600.78x = 29,809.38 × 12,040.40
  4. Step 4: Simplify right side
    21,600.78x = 358,916,709.91
  5. Step 5: Solve for x
    x = 358,916,709.91/21,600.78
  6. Step 6: Final answer
    x = 16,615.91

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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.