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Finding the Fourth Proportional to 387.18, 580.79 and 98.62

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Solution

The fourth proportional to 387.18, 580.79 and 98.62 is: 147.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.18 : 580.79 = 98.62 : x
  2. Step 2: Convert to fraction form
    387.18/580.79 = 98.62/x
  3. Step 3: Cross multiply
    387.18x = 580.79 × 98.62
  4. Step 4: Simplify right side
    387.18x = 57,277.51
  5. Step 5: Solve for x
    x = 57,277.51/387.18
  6. Step 6: Final answer
    x = 147.94

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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.