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Finding the Fourth Proportional to 426,955.92, 640,469.88 and 127,417.20

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Solution

The fourth proportional to 426,955.92, 640,469.88 and 127,417.20 is: 191,136.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,955.92 : 640,469.88 = 127,417.20 : x
  2. Step 2: Convert to fraction form
    426,955.92/640,469.88 = 127,417.20/x
  3. Step 3: Cross multiply
    426,955.92x = 640,469.88 × 127,417.20
  4. Step 4: Simplify right side
    426,955.92x = 81,606,878,793.94
  5. Step 5: Solve for x
    x = 81,606,878,793.94/426,955.92
  6. Step 6: Final answer
    x = 191,136.54

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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.