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Finding the Fourth Proportional to 498.42, 687.30 and 393.33

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Solution

The fourth proportional to 498.42, 687.30 and 393.33 is: 542.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.42 : 687.30 = 393.33 : x
  2. Step 2: Convert to fraction form
    498.42/687.30 = 393.33/x
  3. Step 3: Cross multiply
    498.42x = 687.30 × 393.33
  4. Step 4: Simplify right side
    498.42x = 270,335.71
  5. Step 5: Solve for x
    x = 270,335.71/498.42
  6. Step 6: Final answer
    x = 542.39

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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.