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Finding the Fourth Proportional to 551.54, 761.50 and 421.22

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Solution

The fourth proportional to 551.54, 761.50 and 421.22 is: 581.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.54 : 761.50 = 421.22 : x
  2. Step 2: Convert to fraction form
    551.54/761.50 = 421.22/x
  3. Step 3: Cross multiply
    551.54x = 761.50 × 421.22
  4. Step 4: Simplify right side
    551.54x = 320,759.03
  5. Step 5: Solve for x
    x = 320,759.03/551.54
  6. Step 6: Final answer
    x = 581.57

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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.