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Finding the Fourth Proportional to 614.60, 847.91 and 393.51

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Solution

The fourth proportional to 614.60, 847.91 and 393.51 is: 542.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.60 : 847.91 = 393.51 : x
  2. Step 2: Convert to fraction form
    614.60/847.91 = 393.51/x
  3. Step 3: Cross multiply
    614.60x = 847.91 × 393.51
  4. Step 4: Simplify right side
    614.60x = 333,659.10
  5. Step 5: Solve for x
    x = 333,659.10/614.60
  6. Step 6: Final answer
    x = 542.89

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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.