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Finding the Fourth Proportional to 122,488.40, 183,732.60 and 85,090.70

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Solution

The fourth proportional to 122,488.40, 183,732.60 and 85,090.70 is: 127,636.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,488.40 : 183,732.60 = 85,090.70 : x
  2. Step 2: Convert to fraction form
    122,488.40/183,732.60 = 85,090.70/x
  3. Step 3: Cross multiply
    122,488.40x = 183,732.60 × 85,090.70
  4. Step 4: Simplify right side
    122,488.40x = 15,633,935,546.82
  5. Step 5: Solve for x
    x = 15,633,935,546.82/122,488.40
  6. Step 6: Final answer
    x = 127,636.05

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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.