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Finding the Fourth Proportional to 129,363.31, 178,511.74 and 72,763.75

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Solution

The fourth proportional to 129,363.31, 178,511.74 and 72,763.75 is: 100,408.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,363.31 : 178,511.74 = 72,763.75 : x
  2. Step 2: Convert to fraction form
    129,363.31/178,511.74 = 72,763.75/x
  3. Step 3: Cross multiply
    129,363.31x = 178,511.74 × 72,763.75
  4. Step 4: Simplify right side
    129,363.31x = 12,989,183,621.43
  5. Step 5: Solve for x
    x = 12,989,183,621.43/129,363.31
  6. Step 6: Final answer
    x = 100,408.56

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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.