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Finding the Fourth Proportional to 403.57, 555.42 and 354.36

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Solution

The fourth proportional to 403.57, 555.42 and 354.36 is: 487.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.57 : 555.42 = 354.36 : x
  2. Step 2: Convert to fraction form
    403.57/555.42 = 354.36/x
  3. Step 3: Cross multiply
    403.57x = 555.42 × 354.36
  4. Step 4: Simplify right side
    403.57x = 196,818.63
  5. Step 5: Solve for x
    x = 196,818.63/403.57
  6. Step 6: Final answer
    x = 487.69

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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.