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Finding the Fourth Proportional to 613.62, 918.48 and 393.95

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Solution

The fourth proportional to 613.62, 918.48 and 393.95 is: 589.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.62 : 918.48 = 393.95 : x
  2. Step 2: Convert to fraction form
    613.62/918.48 = 393.95/x
  3. Step 3: Cross multiply
    613.62x = 918.48 × 393.95
  4. Step 4: Simplify right side
    613.62x = 361,830.60
  5. Step 5: Solve for x
    x = 361,830.60/613.62
  6. Step 6: Final answer
    x = 589.67

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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.