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Finding the Fourth Proportional to 777.92, 1,167.84 and 393.92

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Solution

The fourth proportional to 777.92, 1,167.84 and 393.92 is: 591.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.92 : 1,167.84 = 393.92 : x
  2. Step 2: Convert to fraction form
    777.92/1,167.84 = 393.92/x
  3. Step 3: Cross multiply
    777.92x = 1,167.84 × 393.92
  4. Step 4: Simplify right side
    777.92x = 460,035.53
  5. Step 5: Solve for x
    x = 460,035.53/777.92
  6. Step 6: Final answer
    x = 591.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.