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Finding the Fourth Proportional to 401.22, 553.26 and 307.98

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Solution

The fourth proportional to 401.22, 553.26 and 307.98 is: 424.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.22 : 553.26 = 307.98 : x
  2. Step 2: Convert to fraction form
    401.22/553.26 = 307.98/x
  3. Step 3: Cross multiply
    401.22x = 553.26 × 307.98
  4. Step 4: Simplify right side
    401.22x = 170,393.01
  5. Step 5: Solve for x
    x = 170,393.01/401.22
  6. Step 6: Final answer
    x = 424.69

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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.