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Finding the Fourth Proportional to 551.78, 761.43 and 318.98

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Solution

The fourth proportional to 551.78, 761.43 and 318.98 is: 440.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.78 : 761.43 = 318.98 : x
  2. Step 2: Convert to fraction form
    551.78/761.43 = 318.98/x
  3. Step 3: Cross multiply
    551.78x = 761.43 × 318.98
  4. Step 4: Simplify right side
    551.78x = 242,880.94
  5. Step 5: Solve for x
    x = 242,880.94/551.78
  6. Step 6: Final answer
    x = 440.18

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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.