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Finding the Fourth Proportional to 144,761.40, 217,069.20 and 85,615.20

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Solution

The fourth proportional to 144,761.40, 217,069.20 and 85,615.20 is: 128,379.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,761.40 : 217,069.20 = 85,615.20 : x
  2. Step 2: Convert to fraction form
    144,761.40/217,069.20 = 85,615.20/x
  3. Step 3: Cross multiply
    144,761.40x = 217,069.20 × 85,615.20
  4. Step 4: Simplify right side
    144,761.40x = 18,584,422,971.84
  5. Step 5: Solve for x
    x = 18,584,422,971.84/144,761.40
  6. Step 6: Final answer
    x = 128,379.69

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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.