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Finding the Fourth Proportional to 387.74, 581.75 and 192.71

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Solution

The fourth proportional to 387.74, 581.75 and 192.71 is: 289.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.74 : 581.75 = 192.71 : x
  2. Step 2: Convert to fraction form
    387.74/581.75 = 192.71/x
  3. Step 3: Cross multiply
    387.74x = 581.75 × 192.71
  4. Step 4: Simplify right side
    387.74x = 112,110.98
  5. Step 5: Solve for x
    x = 112,110.98/387.74
  6. Step 6: Final answer
    x = 289.14

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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.