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Finding the Fourth Proportional to 551.43, 761.03 and 315.47

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Solution

The fourth proportional to 551.43, 761.03 and 315.47 is: 435.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.43 : 761.03 = 315.47 : x
  2. Step 2: Convert to fraction form
    551.43/761.03 = 315.47/x
  3. Step 3: Cross multiply
    551.43x = 761.03 × 315.47
  4. Step 4: Simplify right side
    551.43x = 240,076.75
  5. Step 5: Solve for x
    x = 240,076.75/551.43
  6. Step 6: Final answer
    x = 435.37

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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.