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Finding the Fourth Proportional to 551.72, 761.16 and 318.80

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Solution

The fourth proportional to 551.72, 761.16 and 318.80 is: 439.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.72 : 761.16 = 318.80 : x
  2. Step 2: Convert to fraction form
    551.72/761.16 = 318.80/x
  3. Step 3: Cross multiply
    551.72x = 761.16 × 318.80
  4. Step 4: Simplify right side
    551.72x = 242,657.81
  5. Step 5: Solve for x
    x = 242,657.81/551.72
  6. Step 6: Final answer
    x = 439.82

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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.