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Finding the Fourth Proportional to 581.40, 871.20 and 386.22

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Solution

The fourth proportional to 581.40, 871.20 and 386.22 is: 578.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.40 : 871.20 = 386.22 : x
  2. Step 2: Convert to fraction form
    581.40/871.20 = 386.22/x
  3. Step 3: Cross multiply
    581.40x = 871.20 × 386.22
  4. Step 4: Simplify right side
    581.40x = 336,474.86
  5. Step 5: Solve for x
    x = 336,474.86/581.40
  6. Step 6: Final answer
    x = 578.73

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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.