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Finding the Fourth Proportional to 345.72, 476.94 and 257.40

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Solution

The fourth proportional to 345.72, 476.94 and 257.40 is: 355.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.72 : 476.94 = 257.40 : x
  2. Step 2: Convert to fraction form
    345.72/476.94 = 257.40/x
  3. Step 3: Cross multiply
    345.72x = 476.94 × 257.40
  4. Step 4: Simplify right side
    345.72x = 122,764.36
  5. Step 5: Solve for x
    x = 122,764.36/345.72
  6. Step 6: Final answer
    x = 355.10

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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.