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Finding the Fourth Proportional to 1,236.47, 1,854.63 and 505.85

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Solution

The fourth proportional to 1,236.47, 1,854.63 and 505.85 is: 758.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.47 : 1,854.63 = 505.85 : x
  2. Step 2: Convert to fraction form
    1,236.47/1,854.63 = 505.85/x
  3. Step 3: Cross multiply
    1,236.47x = 1,854.63 × 505.85
  4. Step 4: Simplify right side
    1,236.47x = 938,155.31
  5. Step 5: Solve for x
    x = 938,155.31/1,236.47
  6. Step 6: Final answer
    x = 758.74

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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.