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Finding the Fourth Proportional to 122,140.70, 183,211.05 and 84,815.90

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Solution

The fourth proportional to 122,140.70, 183,211.05 and 84,815.90 is: 127,223.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,140.70 : 183,211.05 = 84,815.90 : x
  2. Step 2: Convert to fraction form
    122,140.70/183,211.05 = 84,815.90/x
  3. Step 3: Cross multiply
    122,140.70x = 183,211.05 × 84,815.90
  4. Step 4: Simplify right side
    122,140.70x = 15,539,210,095.70
  5. Step 5: Solve for x
    x = 15,539,210,095.70/122,140.70
  6. Step 6: Final answer
    x = 127,223.85

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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.