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Finding the Fourth Proportional to 614.12, 847.78 and 393.20

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Solution

The fourth proportional to 614.12, 847.78 and 393.20 is: 542.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.12 : 847.78 = 393.20 : x
  2. Step 2: Convert to fraction form
    614.12/847.78 = 393.20/x
  3. Step 3: Cross multiply
    614.12x = 847.78 × 393.20
  4. Step 4: Simplify right side
    614.12x = 333,347.66
  5. Step 5: Solve for x
    x = 333,347.66/614.12
  6. Step 6: Final answer
    x = 542.80

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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.