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Finding the Fourth Proportional to 555.11, 766.38 and 493.60

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Solution

The fourth proportional to 555.11, 766.38 and 493.60 is: 681.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.11 : 766.38 = 493.60 : x
  2. Step 2: Convert to fraction form
    555.11/766.38 = 493.60/x
  3. Step 3: Cross multiply
    555.11x = 766.38 × 493.60
  4. Step 4: Simplify right side
    555.11x = 378,283.25
  5. Step 5: Solve for x
    x = 378,283.25/555.11
  6. Step 6: Final answer
    x = 681.45

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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.