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Finding the Fourth Proportional to 1,236.40, 1,854.50 and 505.92

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Solution

The fourth proportional to 1,236.40, 1,854.50 and 505.92 is: 758.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.40 : 1,854.50 = 505.92 : x
  2. Step 2: Convert to fraction form
    1,236.40/1,854.50 = 505.92/x
  3. Step 3: Cross multiply
    1,236.40x = 1,854.50 × 505.92
  4. Step 4: Simplify right side
    1,236.40x = 938,228.64
  5. Step 5: Solve for x
    x = 938,228.64/1,236.40
  6. Step 6: Final answer
    x = 758.84

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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.