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Finding the Fourth Proportional to 345.03, 476.18 and 257.55

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Solution

The fourth proportional to 345.03, 476.18 and 257.55 is: 355.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.03 : 476.18 = 257.55 : x
  2. Step 2: Convert to fraction form
    345.03/476.18 = 257.55/x
  3. Step 3: Cross multiply
    345.03x = 476.18 × 257.55
  4. Step 4: Simplify right side
    345.03x = 122,638.87
  5. Step 5: Solve for x
    x = 122,638.87/345.03
  6. Step 6: Final answer
    x = 355.44

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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.