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Finding the Fourth Proportional to 401.07, 553.51 and 243.66

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Solution

The fourth proportional to 401.07, 553.51 and 243.66 is: 336.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.07 : 553.51 = 243.66 : x
  2. Step 2: Convert to fraction form
    401.07/553.51 = 243.66/x
  3. Step 3: Cross multiply
    401.07x = 553.51 × 243.66
  4. Step 4: Simplify right side
    401.07x = 134,870.63
  5. Step 5: Solve for x
    x = 134,870.63/401.07
  6. Step 6: Final answer
    x = 336.28

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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.