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Finding the Fourth Proportional to 345.36, 476.28 and 308.88

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Solution

The fourth proportional to 345.36, 476.28 and 308.88 is: 425.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.36 : 476.28 = 308.88 : x
  2. Step 2: Convert to fraction form
    345.36/476.28 = 308.88/x
  3. Step 3: Cross multiply
    345.36x = 476.28 × 308.88
  4. Step 4: Simplify right side
    345.36x = 147,113.37
  5. Step 5: Solve for x
    x = 147,113.37/345.36
  6. Step 6: Final answer
    x = 425.97

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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.