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Finding the Fourth Proportional to 1,200.11, 1,800.40 and 506.77

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Solution

The fourth proportional to 1,200.11, 1,800.40 and 506.77 is: 760.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.11 : 1,800.40 = 506.77 : x
  2. Step 2: Convert to fraction form
    1,200.11/1,800.40 = 506.77/x
  3. Step 3: Cross multiply
    1,200.11x = 1,800.40 × 506.77
  4. Step 4: Simplify right side
    1,200.11x = 912,382.94
  5. Step 5: Solve for x
    x = 912,382.94/1,200.11
  6. Step 6: Final answer
    x = 760.25

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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.