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Finding the Fourth Proportional to 552.81, 762.60 and 403.20

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Solution

The fourth proportional to 552.81, 762.60 and 403.20 is: 556.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.81 : 762.60 = 403.20 : x
  2. Step 2: Convert to fraction form
    552.81/762.60 = 403.20/x
  3. Step 3: Cross multiply
    552.81x = 762.60 × 403.20
  4. Step 4: Simplify right side
    552.81x = 307,480.32
  5. Step 5: Solve for x
    x = 307,480.32/552.81
  6. Step 6: Final answer
    x = 556.21

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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.