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Finding the Fourth Proportional to 426,685.14, 640,028.52 and 111,141.54

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Solution

The fourth proportional to 426,685.14, 640,028.52 and 111,141.54 is: 166,712.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,685.14 : 640,028.52 = 111,141.54 : x
  2. Step 2: Convert to fraction form
    426,685.14/640,028.52 = 111,141.54/x
  3. Step 3: Cross multiply
    426,685.14x = 640,028.52 × 111,141.54
  4. Step 4: Simplify right side
    426,685.14x = 71,133,755,356.72
  5. Step 5: Solve for x
    x = 71,133,755,356.72/426,685.14
  6. Step 6: Final answer
    x = 166,712.52

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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.