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Finding the Fourth Proportional to 487.78, 671.61 and 422.98

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Solution

The fourth proportional to 487.78, 671.61 and 422.98 is: 582.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.78 : 671.61 = 422.98 : x
  2. Step 2: Convert to fraction form
    487.78/671.61 = 422.98/x
  3. Step 3: Cross multiply
    487.78x = 671.61 × 422.98
  4. Step 4: Simplify right side
    487.78x = 284,077.60
  5. Step 5: Solve for x
    x = 284,077.60/487.78
  6. Step 6: Final answer
    x = 582.39

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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.