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Finding the Fourth Proportional to 354.36, 488.68 and 256.08

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Solution

The fourth proportional to 354.36, 488.68 and 256.08 is: 353.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.36 : 488.68 = 256.08 : x
  2. Step 2: Convert to fraction form
    354.36/488.68 = 256.08/x
  3. Step 3: Cross multiply
    354.36x = 488.68 × 256.08
  4. Step 4: Simplify right side
    354.36x = 125,141.17
  5. Step 5: Solve for x
    x = 125,141.17/354.36
  6. Step 6: Final answer
    x = 353.15

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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.