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Finding the Fourth Proportional to 387.10, 580.66 and 143.58

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Solution

The fourth proportional to 387.10, 580.66 and 143.58 is: 215.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.10 : 580.66 = 143.58 : x
  2. Step 2: Convert to fraction form
    387.10/580.66 = 143.58/x
  3. Step 3: Cross multiply
    387.10x = 580.66 × 143.58
  4. Step 4: Simplify right side
    387.10x = 83,371.16
  5. Step 5: Solve for x
    x = 83,371.16/387.10
  6. Step 6: Final answer
    x = 215.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.