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Finding the Fourth Proportional to 688.06, 949.48 and 393.32

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Solution

The fourth proportional to 688.06, 949.48 and 393.32 is: 542.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.06 : 949.48 = 393.32 : x
  2. Step 2: Convert to fraction form
    688.06/949.48 = 393.32/x
  3. Step 3: Cross multiply
    688.06x = 949.48 × 393.32
  4. Step 4: Simplify right side
    688.06x = 373,449.47
  5. Step 5: Solve for x
    x = 373,449.47/688.06
  6. Step 6: Final answer
    x = 542.76

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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.