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Finding the Fourth Proportional to 558.78, 770.86 and 393.10

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Solution

The fourth proportional to 558.78, 770.86 and 393.10 is: 542.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.78 : 770.86 = 393.10 : x
  2. Step 2: Convert to fraction form
    558.78/770.86 = 393.10/x
  3. Step 3: Cross multiply
    558.78x = 770.86 × 393.10
  4. Step 4: Simplify right side
    558.78x = 303,025.07
  5. Step 5: Solve for x
    x = 303,025.07/558.78
  6. Step 6: Final answer
    x = 542.30

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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.