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Finding the Fourth Proportional to 401.52, 556.68 and 393.60

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Solution

The fourth proportional to 401.52, 556.68 and 393.60 is: 545.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.52 : 556.68 = 393.60 : x
  2. Step 2: Convert to fraction form
    401.52/556.68 = 393.60/x
  3. Step 3: Cross multiply
    401.52x = 556.68 × 393.60
  4. Step 4: Simplify right side
    401.52x = 219,109.25
  5. Step 5: Solve for x
    x = 219,109.25/401.52
  6. Step 6: Final answer
    x = 545.70

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.