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Finding the Fourth Proportional to 688.34, 949.80 and 393.62

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Solution

The fourth proportional to 688.34, 949.80 and 393.62 is: 543.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.34 : 949.80 = 393.62 : x
  2. Step 2: Convert to fraction form
    688.34/949.80 = 393.62/x
  3. Step 3: Cross multiply
    688.34x = 949.80 × 393.62
  4. Step 4: Simplify right side
    688.34x = 373,860.28
  5. Step 5: Solve for x
    x = 373,860.28/688.34
  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.