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Finding the Fourth Proportional to 426,938.70, 640,440.51 and 127,395.90

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Solution

The fourth proportional to 426,938.70, 640,440.51 and 127,395.90 is: 191,103.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,938.70 : 640,440.51 = 127,395.90 : x
  2. Step 2: Convert to fraction form
    426,938.70/640,440.51 = 127,395.90/x
  3. Step 3: Cross multiply
    426,938.70x = 640,440.51 × 127,395.90
  4. Step 4: Simplify right side
    426,938.70x = 81,589,495,167.91
  5. Step 5: Solve for x
    x = 81,589,495,167.91/426,938.70
  6. Step 6: Final answer
    x = 191,103.54

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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.