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Finding the Fourth Proportional to 387.39, 581.07 and 130.89

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Solution

The fourth proportional to 387.39, 581.07 and 130.89 is: 196.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.39 : 581.07 = 130.89 : x
  2. Step 2: Convert to fraction form
    387.39/581.07 = 130.89/x
  3. Step 3: Cross multiply
    387.39x = 581.07 × 130.89
  4. Step 4: Simplify right side
    387.39x = 76,056.25
  5. Step 5: Solve for x
    x = 76,056.25/387.39
  6. Step 6: Final answer
    x = 196.33

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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.