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Finding the Fourth Proportional to 387.50, 581.24 and 113.60

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Solution

The fourth proportional to 387.50, 581.24 and 113.60 is: 170.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.50 : 581.24 = 113.60 : x
  2. Step 2: Convert to fraction form
    387.50/581.24 = 113.60/x
  3. Step 3: Cross multiply
    387.50x = 581.24 × 113.60
  4. Step 4: Simplify right side
    387.50x = 66,030.60
  5. Step 5: Solve for x
    x = 66,030.60/387.50
  6. Step 6: Final answer
    x = 170.40

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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.