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Finding the Fourth Proportional to 1,236.90, 1,854.90 and 496.20

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Solution

The fourth proportional to 1,236.90, 1,854.90 and 496.20 is: 744.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.90 : 1,854.90 = 496.20 : x
  2. Step 2: Convert to fraction form
    1,236.90/1,854.90 = 496.20/x
  3. Step 3: Cross multiply
    1,236.90x = 1,854.90 × 496.20
  4. Step 4: Simplify right side
    1,236.90x = 920,401.38
  5. Step 5: Solve for x
    x = 920,401.38/1,236.90
  6. Step 6: Final answer
    x = 744.12

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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.