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Finding the Fourth Proportional to 917,138.70, 1,375,902.45 and 277,389.90

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Solution

The fourth proportional to 917,138.70, 1,375,902.45 and 277,389.90 is: 416,143.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    917,138.70 : 1,375,902.45 = 277,389.90 : x
  2. Step 2: Convert to fraction form
    917,138.70/1,375,902.45 = 277,389.90/x
  3. Step 3: Cross multiply
    917,138.70x = 1,375,902.45 × 277,389.90
  4. Step 4: Simplify right side
    917,138.70x = 381,661,443,015.26
  5. Step 5: Solve for x
    x = 381,661,443,015.26/917,138.70
  6. Step 6: Final answer
    x = 416,143.65

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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.