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Finding the Fourth Proportional to 578.08, 867.55 and 424.40

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Solution

The fourth proportional to 578.08, 867.55 and 424.40 is: 636.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.08 : 867.55 = 424.40 : x
  2. Step 2: Convert to fraction form
    578.08/867.55 = 424.40/x
  3. Step 3: Cross multiply
    578.08x = 867.55 × 424.40
  4. Step 4: Simplify right side
    578.08x = 368,188.22
  5. Step 5: Solve for x
    x = 368,188.22/578.08
  6. Step 6: Final answer
    x = 636.92

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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.