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Finding the Fourth Proportional to 688.46, 949.85 and 393.67

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Solution

The fourth proportional to 688.46, 949.85 and 393.67 is: 543.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.46 : 949.85 = 393.67 : x
  2. Step 2: Convert to fraction form
    688.46/949.85 = 393.67/x
  3. Step 3: Cross multiply
    688.46x = 949.85 × 393.67
  4. Step 4: Simplify right side
    688.46x = 373,920.73
  5. Step 5: Solve for x
    x = 373,920.73/688.46
  6. Step 6: Final answer
    x = 543.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.