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Finding the Fourth Proportional to 403.28, 602.02 and 385.55

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Solution

The fourth proportional to 403.28, 602.02 and 385.55 is: 575.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.28 : 602.02 = 385.55 : x
  2. Step 2: Convert to fraction form
    403.28/602.02 = 385.55/x
  3. Step 3: Cross multiply
    403.28x = 602.02 × 385.55
  4. Step 4: Simplify right side
    403.28x = 232,109.77
  5. Step 5: Solve for x
    x = 232,109.77/403.28
  6. Step 6: Final answer
    x = 575.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.