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Finding the Fourth Proportional to 578.78, 867.41 and 424.93

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Solution

The fourth proportional to 578.78, 867.41 and 424.93 is: 636.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.78 : 867.41 = 424.93 : x
  2. Step 2: Convert to fraction form
    578.78/867.41 = 424.93/x
  3. Step 3: Cross multiply
    578.78x = 867.41 × 424.93
  4. Step 4: Simplify right side
    578.78x = 368,588.53
  5. Step 5: Solve for x
    x = 368,588.53/578.78
  6. Step 6: Final answer
    x = 636.84

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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.