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Finding the Fourth Proportional to 345.15, 476.31 and 187.79

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Solution

The fourth proportional to 345.15, 476.31 and 187.79 is: 259.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.15 : 476.31 = 187.79 : x
  2. Step 2: Convert to fraction form
    345.15/476.31 = 187.79/x
  3. Step 3: Cross multiply
    345.15x = 476.31 × 187.79
  4. Step 4: Simplify right side
    345.15x = 89,447.01
  5. Step 5: Solve for x
    x = 89,447.01/345.15
  6. Step 6: Final answer
    x = 259.16

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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.