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Finding the Fourth Proportional to 578.97, 798.74 and 421.26

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Solution

The fourth proportional to 578.97, 798.74 and 421.26 is: 581.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.97 : 798.74 = 421.26 : x
  2. Step 2: Convert to fraction form
    578.97/798.74 = 421.26/x
  3. Step 3: Cross multiply
    578.97x = 798.74 × 421.26
  4. Step 4: Simplify right side
    578.97x = 336,471.11
  5. Step 5: Solve for x
    x = 336,471.11/578.97
  6. Step 6: Final answer
    x = 581.15

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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.