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Finding the Fourth Proportional to 426,944.78, 640,406.15 and 138,754.81

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Solution

The fourth proportional to 426,944.78, 640,406.15 and 138,754.81 is: 208,128.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,944.78 : 640,406.15 = 138,754.81 : x
  2. Step 2: Convert to fraction form
    426,944.78/640,406.15 = 138,754.81/x
  3. Step 3: Cross multiply
    426,944.78x = 640,406.15 × 138,754.81
  4. Step 4: Simplify right side
    426,944.78x = 88,859,435,493.91
  5. Step 5: Solve for x
    x = 88,859,435,493.91/426,944.78
  6. Step 6: Final answer
    x = 208,128.64

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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.