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Finding the Fourth Proportional to 345.78, 476.70 and 251.16

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Solution

The fourth proportional to 345.78, 476.70 and 251.16 is: 346.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.78 : 476.70 = 251.16 : x
  2. Step 2: Convert to fraction form
    345.78/476.70 = 251.16/x
  3. Step 3: Cross multiply
    345.78x = 476.70 × 251.16
  4. Step 4: Simplify right side
    345.78x = 119,727.97
  5. Step 5: Solve for x
    x = 119,727.97/345.78
  6. Step 6: Final answer
    x = 346.25

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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.