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Finding the Fourth Proportional to 426,817.20, 640,258.20 and 127,274.34

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Solution

The fourth proportional to 426,817.20, 640,258.20 and 127,274.34 is: 190,921.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,817.20 : 640,258.20 = 127,274.34 : x
  2. Step 2: Convert to fraction form
    426,817.20/640,258.20 = 127,274.34/x
  3. Step 3: Cross multiply
    426,817.20x = 640,258.20 × 127,274.34
  4. Step 4: Simplify right side
    426,817.20x = 81,488,439,834.59
  5. Step 5: Solve for x
    x = 81,488,439,834.59/426,817.20
  6. Step 6: Final answer
    x = 190,921.17

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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.