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Finding the Fourth Proportional to 387.11, 530.09 and 371.61

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Solution

The fourth proportional to 387.11, 530.09 and 371.61 is: 508.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.11 : 530.09 = 371.61 : x
  2. Step 2: Convert to fraction form
    387.11/530.09 = 371.61/x
  3. Step 3: Cross multiply
    387.11x = 530.09 × 371.61
  4. Step 4: Simplify right side
    387.11x = 196,984.89
  5. Step 5: Solve for x
    x = 196,984.89/387.11
  6. Step 6: Final answer
    x = 508.87

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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.