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Finding the Fourth Proportional to 555.44, 766.54 and 398.12

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Solution

The fourth proportional to 555.44, 766.54 and 398.12 is: 549.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.44 : 766.54 = 398.12 : x
  2. Step 2: Convert to fraction form
    555.44/766.54 = 398.12/x
  3. Step 3: Cross multiply
    555.44x = 766.54 × 398.12
  4. Step 4: Simplify right side
    555.44x = 305,174.90
  5. Step 5: Solve for x
    x = 305,174.90/555.44
  6. Step 6: Final answer
    x = 549.43

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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.