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Finding the Fourth Proportional to 551.61, 761.29 and 318.74

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Solution

The fourth proportional to 551.61, 761.29 and 318.74 is: 439.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.61 : 761.29 = 318.74 : x
  2. Step 2: Convert to fraction form
    551.61/761.29 = 318.74/x
  3. Step 3: Cross multiply
    551.61x = 761.29 × 318.74
  4. Step 4: Simplify right side
    551.61x = 242,649.37
  5. Step 5: Solve for x
    x = 242,649.37/551.61
  6. Step 6: Final answer
    x = 439.89

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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.