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Finding the Fourth Proportional to 80,970.90, 121,427.55 and 36,618.90

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Solution

The fourth proportional to 80,970.90, 121,427.55 and 36,618.90 is: 54,915.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,970.90 : 121,427.55 = 36,618.90 : x
  2. Step 2: Convert to fraction form
    80,970.90/121,427.55 = 36,618.90/x
  3. Step 3: Cross multiply
    80,970.90x = 121,427.55 × 36,618.90
  4. Step 4: Simplify right side
    80,970.90x = 4,446,543,310.70
  5. Step 5: Solve for x
    x = 4,446,543,310.70/80,970.90
  6. Step 6: Final answer
    x = 54,915.33

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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.