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Finding the Fourth Proportional to 387.53, 581.15 and 113.55

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Solution

The fourth proportional to 387.53, 581.15 and 113.55 is: 170.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.53 : 581.15 = 113.55 : x
  2. Step 2: Convert to fraction form
    387.53/581.15 = 113.55/x
  3. Step 3: Cross multiply
    387.53x = 581.15 × 113.55
  4. Step 4: Simplify right side
    387.53x = 65,989.01
  5. Step 5: Solve for x
    x = 65,989.01/387.53
  6. Step 6: Final answer
    x = 170.28

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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.