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Finding the Fourth Proportional to 387.19, 580.76 and 192.11

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Solution

The fourth proportional to 387.19, 580.76 and 192.11 is: 288.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.19 : 580.76 = 192.11 : x
  2. Step 2: Convert to fraction form
    387.19/580.76 = 192.11/x
  3. Step 3: Cross multiply
    387.19x = 580.76 × 192.11
  4. Step 4: Simplify right side
    387.19x = 111,571.74
  5. Step 5: Solve for x
    x = 111,571.74/387.19
  6. Step 6: Final answer
    x = 288.16

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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.