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Finding the Fourth Proportional to 426,755.32, 640,124.70 and 127,438.72

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Solution

The fourth proportional to 426,755.32, 640,124.70 and 127,438.72 is: 191,155.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,755.32 : 640,124.70 = 127,438.72 : x
  2. Step 2: Convert to fraction form
    426,755.32/640,124.70 = 127,438.72/x
  3. Step 3: Cross multiply
    426,755.32x = 640,124.70 × 127,438.72
  4. Step 4: Simplify right side
    426,755.32x = 81,576,672,408.38
  5. Step 5: Solve for x
    x = 81,576,672,408.38/426,755.32
  6. Step 6: Final answer
    x = 191,155.61

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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.