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Finding the Fourth Proportional to 401.25, 552.40 and 345.77

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Solution

The fourth proportional to 401.25, 552.40 and 345.77 is: 476.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.25 : 552.40 = 345.77 : x
  2. Step 2: Convert to fraction form
    401.25/552.40 = 345.77/x
  3. Step 3: Cross multiply
    401.25x = 552.40 × 345.77
  4. Step 4: Simplify right side
    401.25x = 191,003.35
  5. Step 5: Solve for x
    x = 191,003.35/401.25
  6. Step 6: Final answer
    x = 476.02

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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.