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Finding the Fourth Proportional to 345.18, 476.37 and 286.86

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Solution

The fourth proportional to 345.18, 476.37 and 286.86 is: 395.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.18 : 476.37 = 286.86 : x
  2. Step 2: Convert to fraction form
    345.18/476.37 = 286.86/x
  3. Step 3: Cross multiply
    345.18x = 476.37 × 286.86
  4. Step 4: Simplify right side
    345.18x = 136,651.50
  5. Step 5: Solve for x
    x = 136,651.50/345.18
  6. Step 6: Final answer
    x = 395.88

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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.