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Finding the Fourth Proportional to 554.98, 765.78 and 318.93

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Solution

The fourth proportional to 554.98, 765.78 and 318.93 is: 440.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.98 : 765.78 = 318.93 : x
  2. Step 2: Convert to fraction form
    554.98/765.78 = 318.93/x
  3. Step 3: Cross multiply
    554.98x = 765.78 × 318.93
  4. Step 4: Simplify right side
    554.98x = 244,234.28
  5. Step 5: Solve for x
    x = 244,234.28/554.98
  6. Step 6: Final answer
    x = 440.08

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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.