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Finding the Fourth Proportional to 892.05, 1,230.71 and 555.80

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Solution

The fourth proportional to 892.05, 1,230.71 and 555.80 is: 766.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.05 : 1,230.71 = 555.80 : x
  2. Step 2: Convert to fraction form
    892.05/1,230.71 = 555.80/x
  3. Step 3: Cross multiply
    892.05x = 1,230.71 × 555.80
  4. Step 4: Simplify right side
    892.05x = 684,028.92
  5. Step 5: Solve for x
    x = 684,028.92/892.05
  6. Step 6: Final answer
    x = 766.80

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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.