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Finding the Fourth Proportional to 401.00, 555.71 and 393.71

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Solution

The fourth proportional to 401.00, 555.71 and 393.71 is: 545.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.00 : 555.71 = 393.71 : x
  2. Step 2: Convert to fraction form
    401.00/555.71 = 393.71/x
  3. Step 3: Cross multiply
    401.00x = 555.71 × 393.71
  4. Step 4: Simplify right side
    401.00x = 218,783.84
  5. Step 5: Solve for x
    x = 218,783.84/401.00
  6. Step 6: Final answer
    x = 545.60

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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.