Home / 21,512.78-29,684.15-13,445.48

Finding the Fourth Proportional to 21,512.78, 29,684.15 and 13,445.48

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Solution

The fourth proportional to 21,512.78, 29,684.15 and 13,445.48 is: 18,552.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,512.78 : 29,684.15 = 13,445.48 : x
  2. Step 2: Convert to fraction form
    21,512.78/29,684.15 = 13,445.48/x
  3. Step 3: Cross multiply
    21,512.78x = 29,684.15 × 13,445.48
  4. Step 4: Simplify right side
    21,512.78x = 399,117,778.18
  5. Step 5: Solve for x
    x = 399,117,778.18/21,512.78
  6. Step 6: Final answer
    x = 18,552.59

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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.