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Finding the Fourth Proportional to 647.74, 893.86 and 426.61

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Solution

The fourth proportional to 647.74, 893.86 and 426.61 is: 588.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.74 : 893.86 = 426.61 : x
  2. Step 2: Convert to fraction form
    647.74/893.86 = 426.61/x
  3. Step 3: Cross multiply
    647.74x = 893.86 × 426.61
  4. Step 4: Simplify right side
    647.74x = 381,329.61
  5. Step 5: Solve for x
    x = 381,329.61/647.74
  6. Step 6: Final answer
    x = 588.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.