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Finding the Fourth Proportional to 122,645.70, 183,531.15 and 85,029.30

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Solution

The fourth proportional to 122,645.70, 183,531.15 and 85,029.30 is: 127,240.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,645.70 : 183,531.15 = 85,029.30 : x
  2. Step 2: Convert to fraction form
    122,645.70/183,531.15 = 85,029.30/x
  3. Step 3: Cross multiply
    122,645.70x = 183,531.15 × 85,029.30
  4. Step 4: Simplify right side
    122,645.70x = 15,605,525,212.70
  5. Step 5: Solve for x
    x = 15,605,525,212.70/122,645.70
  6. Step 6: Final answer
    x = 127,240.70

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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.