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Finding the Fourth Proportional to 378.12, 521.13 and 299.16

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Solution

The fourth proportional to 378.12, 521.13 and 299.16 is: 412.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.12 : 521.13 = 299.16 : x
  2. Step 2: Convert to fraction form
    378.12/521.13 = 299.16/x
  3. Step 3: Cross multiply
    378.12x = 521.13 × 299.16
  4. Step 4: Simplify right side
    378.12x = 155,901.25
  5. Step 5: Solve for x
    x = 155,901.25/378.12
  6. Step 6: Final answer
    x = 412.31

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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.