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Finding the Fourth Proportional to 21,308.78, 29,407.12 and 11,877.41

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Solution

The fourth proportional to 21,308.78, 29,407.12 and 11,877.41 is: 16,391.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,308.78 : 29,407.12 = 11,877.41 : x
  2. Step 2: Convert to fraction form
    21,308.78/29,407.12 = 11,877.41/x
  3. Step 3: Cross multiply
    21,308.78x = 29,407.12 × 11,877.41
  4. Step 4: Simplify right side
    21,308.78x = 349,280,421.16
  5. Step 5: Solve for x
    x = 349,280,421.16/21,308.78
  6. Step 6: Final answer
    x = 16,391.39

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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.