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Finding the Fourth Proportional to 551.91, 761.70 and 315.95

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Solution

The fourth proportional to 551.91, 761.70 and 315.95 is: 436.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.91 : 761.70 = 315.95 : x
  2. Step 2: Convert to fraction form
    551.91/761.70 = 315.95/x
  3. Step 3: Cross multiply
    551.91x = 761.70 × 315.95
  4. Step 4: Simplify right side
    551.91x = 240,660.78
  5. Step 5: Solve for x
    x = 240,660.78/551.91
  6. Step 6: Final answer
    x = 436.05

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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.