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Finding the Fourth Proportional to 378.36, 521.19 and 316.17

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Solution

The fourth proportional to 378.36, 521.19 and 316.17 is: 435.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.36 : 521.19 = 316.17 : x
  2. Step 2: Convert to fraction form
    378.36/521.19 = 316.17/x
  3. Step 3: Cross multiply
    378.36x = 521.19 × 316.17
  4. Step 4: Simplify right side
    378.36x = 164,784.64
  5. Step 5: Solve for x
    x = 164,784.64/378.36
  6. Step 6: Final answer
    x = 435.52

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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.