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Finding the Fourth Proportional to 688.08, 949.32 and 393.14

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Solution

The fourth proportional to 688.08, 949.32 and 393.14 is: 542.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.08 : 949.32 = 393.14 : x
  2. Step 2: Convert to fraction form
    688.08/949.32 = 393.14/x
  3. Step 3: Cross multiply
    688.08x = 949.32 × 393.14
  4. Step 4: Simplify right side
    688.08x = 373,215.66
  5. Step 5: Solve for x
    x = 373,215.66/688.08
  6. Step 6: Final answer
    x = 542.40

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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.