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Finding the Fourth Proportional to 554.47, 765.11 and 318.35

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Solution

The fourth proportional to 554.47, 765.11 and 318.35 is: 439.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.47 : 765.11 = 318.35 : x
  2. Step 2: Convert to fraction form
    554.47/765.11 = 318.35/x
  3. Step 3: Cross multiply
    554.47x = 765.11 × 318.35
  4. Step 4: Simplify right side
    554.47x = 243,571.17
  5. Step 5: Solve for x
    x = 243,571.17/554.47
  6. Step 6: Final answer
    x = 439.29

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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.