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Finding the Fourth Proportional to 551.90, 761.76 and 319.02

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Solution

The fourth proportional to 551.90, 761.76 and 319.02 is: 440.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.90 : 761.76 = 319.02 : x
  2. Step 2: Convert to fraction form
    551.90/761.76 = 319.02/x
  3. Step 3: Cross multiply
    551.90x = 761.76 × 319.02
  4. Step 4: Simplify right side
    551.90x = 243,016.68
  5. Step 5: Solve for x
    x = 243,016.68/551.90
  6. Step 6: Final answer
    x = 440.33

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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.