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Finding the Fourth Proportional to 1,169.86, 1,755.12 and 389.92

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Solution

The fourth proportional to 1,169.86, 1,755.12 and 389.92 is: 584.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.86 : 1,755.12 = 389.92 : x
  2. Step 2: Convert to fraction form
    1,169.86/1,755.12 = 389.92/x
  3. Step 3: Cross multiply
    1,169.86x = 1,755.12 × 389.92
  4. Step 4: Simplify right side
    1,169.86x = 684,356.39
  5. Step 5: Solve for x
    x = 684,356.39/1,169.86
  6. Step 6: Final answer
    x = 584.99

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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.