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Finding the Fourth Proportional to 399.93, 549.78 and 357.48

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Solution

The fourth proportional to 399.93, 549.78 and 357.48 is: 491.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.93 : 549.78 = 357.48 : x
  2. Step 2: Convert to fraction form
    399.93/549.78 = 357.48/x
  3. Step 3: Cross multiply
    399.93x = 549.78 × 357.48
  4. Step 4: Simplify right side
    399.93x = 196,535.35
  5. Step 5: Solve for x
    x = 196,535.35/399.93
  6. Step 6: Final answer
    x = 491.42

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.