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Finding the Fourth Proportional to 387.11, 581.18 and 383.03

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Solution

The fourth proportional to 387.11, 581.18 and 383.03 is: 575.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.11 : 581.18 = 383.03 : x
  2. Step 2: Convert to fraction form
    387.11/581.18 = 383.03/x
  3. Step 3: Cross multiply
    387.11x = 581.18 × 383.03
  4. Step 4: Simplify right side
    387.11x = 222,605.51
  5. Step 5: Solve for x
    x = 222,605.51/387.11
  6. Step 6: Final answer
    x = 575.05

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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.