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Finding the Fourth Proportional to 614.58, 847.68 and 393.81

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Solution

The fourth proportional to 614.58, 847.68 and 393.81 is: 543.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.58 : 847.68 = 393.81 : x
  2. Step 2: Convert to fraction form
    614.58/847.68 = 393.81/x
  3. Step 3: Cross multiply
    614.58x = 847.68 × 393.81
  4. Step 4: Simplify right side
    614.58x = 333,824.86
  5. Step 5: Solve for x
    x = 333,824.86/614.58
  6. Step 6: Final answer
    x = 543.18

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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.