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Finding the Fourth Proportional to 558.82, 771.65 and 393.40

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Solution

The fourth proportional to 558.82, 771.65 and 393.40 is: 543.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.82 : 771.65 = 393.40 : x
  2. Step 2: Convert to fraction form
    558.82/771.65 = 393.40/x
  3. Step 3: Cross multiply
    558.82x = 771.65 × 393.40
  4. Step 4: Simplify right side
    558.82x = 303,567.11
  5. Step 5: Solve for x
    x = 303,567.11/558.82
  6. Step 6: Final answer
    x = 543.23

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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.