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Finding the Fourth Proportional to 426,679.84, 640,019.56 and 127,152.78

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Solution

The fourth proportional to 426,679.84, 640,019.56 and 127,152.78 is: 190,729.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,679.84 : 640,019.56 = 127,152.78 : x
  2. Step 2: Convert to fraction form
    426,679.84/640,019.56 = 127,152.78/x
  3. Step 3: Cross multiply
    426,679.84x = 640,019.56 × 127,152.78
  4. Step 4: Simplify right side
    426,679.84x = 81,380,266,308.38
  5. Step 5: Solve for x
    x = 81,380,266,308.38/426,679.84
  6. Step 6: Final answer
    x = 190,729.11

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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.