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Finding the Fourth Proportional to 43,081.70, 64,632.86 and 20,869.11

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Solution

The fourth proportional to 43,081.70, 64,632.86 and 20,869.11 is: 31,308.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,081.70 : 64,632.86 = 20,869.11 : x
  2. Step 2: Convert to fraction form
    43,081.70/64,632.86 = 20,869.11/x
  3. Step 3: Cross multiply
    43,081.70x = 64,632.86 × 20,869.11
  4. Step 4: Simplify right side
    43,081.70x = 1,348,830,264.95
  5. Step 5: Solve for x
    x = 1,348,830,264.95/43,081.70
  6. Step 6: Final answer
    x = 31,308.66

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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.