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Finding the Fourth Proportional to 287.15, 394.34 and 245.70

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Solution

The fourth proportional to 287.15, 394.34 and 245.70 is: 337.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.15 : 394.34 = 245.70 : x
  2. Step 2: Convert to fraction form
    287.15/394.34 = 245.70/x
  3. Step 3: Cross multiply
    287.15x = 394.34 × 245.70
  4. Step 4: Simplify right side
    287.15x = 96,888.11
  5. Step 5: Solve for x
    x = 96,888.11/287.15
  6. Step 6: Final answer
    x = 337.42

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.