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Finding the Fourth Proportional to 551.82, 761.53 and 315.79

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Solution

The fourth proportional to 551.82, 761.53 and 315.79 is: 435.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.82 : 761.53 = 315.79 : x
  2. Step 2: Convert to fraction form
    551.82/761.53 = 315.79/x
  3. Step 3: Cross multiply
    551.82x = 761.53 × 315.79
  4. Step 4: Simplify right side
    551.82x = 240,484.67
  5. Step 5: Solve for x
    x = 240,484.67/551.82
  6. Step 6: Final answer
    x = 435.80

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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.