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Finding the Fourth Proportional to 254.19, 378.79 and 247.15

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Solution

The fourth proportional to 254.19, 378.79 and 247.15 is: 368.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.19 : 378.79 = 247.15 : x
  2. Step 2: Convert to fraction form
    254.19/378.79 = 247.15/x
  3. Step 3: Cross multiply
    254.19x = 378.79 × 247.15
  4. Step 4: Simplify right side
    254.19x = 93,616.71
  5. Step 5: Solve for x
    x = 93,616.71/254.19
  6. Step 6: Final answer
    x = 368.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.