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Finding the Fourth Proportional to 554.89, 765.72 and 318.80

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Solution

The fourth proportional to 554.89, 765.72 and 318.80 is: 439.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.89 : 765.72 = 318.80 : x
  2. Step 2: Convert to fraction form
    554.89/765.72 = 318.80/x
  3. Step 3: Cross multiply
    554.89x = 765.72 × 318.80
  4. Step 4: Simplify right side
    554.89x = 244,108.87
  5. Step 5: Solve for x
    x = 244,108.87/554.89
  6. Step 6: Final answer
    x = 439.92

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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.