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Finding the Fourth Proportional to 81,191.10, 121,805.10 and 36,830.55

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Solution

The fourth proportional to 81,191.10, 121,805.10 and 36,830.55 is: 55,254.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,191.10 : 121,805.10 = 36,830.55 : x
  2. Step 2: Convert to fraction form
    81,191.10/121,805.10 = 36,830.55/x
  3. Step 3: Cross multiply
    81,191.10x = 121,805.10 × 36,830.55
  4. Step 4: Simplify right side
    81,191.10x = 4,486,148,825.81
  5. Step 5: Solve for x
    x = 4,486,148,825.81/81,191.10
  6. Step 6: Final answer
    x = 55,254.19

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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.