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Finding the Fourth Proportional to 81,072.70, 121,551.45 and 36,720.70

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Solution

The fourth proportional to 81,072.70, 121,551.45 and 36,720.70 is: 55,054.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,072.70 : 121,551.45 = 36,720.70 : x
  2. Step 2: Convert to fraction form
    81,072.70/121,551.45 = 36,720.70/x
  3. Step 3: Cross multiply
    81,072.70x = 121,551.45 × 36,720.70
  4. Step 4: Simplify right side
    81,072.70x = 4,463,454,330.02
  5. Step 5: Solve for x
    x = 4,463,454,330.02/81,072.70
  6. Step 6: Final answer
    x = 55,054.96

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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.