Home / 78,414.12-117,638.82-25,821.72

Finding the Fourth Proportional to 78,414.12, 117,638.82 and 25,821.72

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Solution

The fourth proportional to 78,414.12, 117,638.82 and 25,821.72 is: 38,738.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,414.12 : 117,638.82 = 25,821.72 : x
  2. Step 2: Convert to fraction form
    78,414.12/117,638.82 = 25,821.72/x
  3. Step 3: Cross multiply
    78,414.12x = 117,638.82 × 25,821.72
  4. Step 4: Simplify right side
    78,414.12x = 3,037,636,671.17
  5. Step 5: Solve for x
    x = 3,037,636,671.17/78,414.12
  6. Step 6: Final answer
    x = 38,738.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.