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Finding the Fourth Proportional to 386.98, 581.68 and 243.61

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Solution

The fourth proportional to 386.98, 581.68 and 243.61 is: 366.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.98 : 581.68 = 243.61 : x
  2. Step 2: Convert to fraction form
    386.98/581.68 = 243.61/x
  3. Step 3: Cross multiply
    386.98x = 581.68 × 243.61
  4. Step 4: Simplify right side
    386.98x = 141,701.92
  5. Step 5: Solve for x
    x = 141,701.92/386.98
  6. Step 6: Final answer
    x = 366.18

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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.