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Finding the Fourth Proportional to 69,761.72, 104,642.59 and 20,513.72

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Solution

The fourth proportional to 69,761.72, 104,642.59 and 20,513.72 is: 30,770.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,761.72 : 104,642.59 = 20,513.72 : x
  2. Step 2: Convert to fraction form
    69,761.72/104,642.59 = 20,513.72/x
  3. Step 3: Cross multiply
    69,761.72x = 104,642.59 × 20,513.72
  4. Step 4: Simplify right side
    69,761.72x = 2,146,609,001.66
  5. Step 5: Solve for x
    x = 2,146,609,001.66/69,761.72
  6. Step 6: Final answer
    x = 30,770.58

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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.