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Finding the Fourth Proportional to 101,720.46, 140,299.47 and 69,890.70

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Solution

The fourth proportional to 101,720.46, 140,299.47 and 69,890.70 is: 96,397.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,720.46 : 140,299.47 = 69,890.70 : x
  2. Step 2: Convert to fraction form
    101,720.46/140,299.47 = 69,890.70/x
  3. Step 3: Cross multiply
    101,720.46x = 140,299.47 × 69,890.70
  4. Step 4: Simplify right side
    101,720.46x = 9,805,628,167.93
  5. Step 5: Solve for x
    x = 9,805,628,167.93/101,720.46
  6. Step 6: Final answer
    x = 96,397.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.