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Finding the Fourth Proportional to 386.42, 578.98 and 372.20

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Solution

The fourth proportional to 386.42, 578.98 and 372.20 is: 557.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.42 : 578.98 = 372.20 : x
  2. Step 2: Convert to fraction form
    386.42/578.98 = 372.20/x
  3. Step 3: Cross multiply
    386.42x = 578.98 × 372.20
  4. Step 4: Simplify right side
    386.42x = 215,493.93
  5. Step 5: Solve for x
    x = 215,493.93/386.42
  6. Step 6: Final answer
    x = 557.67

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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.