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Finding the Fourth Proportional to 387.55, 581.90 and 380.63

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Solution

The fourth proportional to 387.55, 581.90 and 380.63 is: 571.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.55 : 581.90 = 380.63 : x
  2. Step 2: Convert to fraction form
    387.55/581.90 = 380.63/x
  3. Step 3: Cross multiply
    387.55x = 581.90 × 380.63
  4. Step 4: Simplify right side
    387.55x = 221,491.39
  5. Step 5: Solve for x
    x = 221,491.39/387.55
  6. Step 6: Final answer
    x = 571.51

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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.