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Finding the Fourth Proportional to 1,236.60, 1,853.69 and 619.38

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Solution

The fourth proportional to 1,236.60, 1,853.69 and 619.38 is: 928.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.60 : 1,853.69 = 619.38 : x
  2. Step 2: Convert to fraction form
    1,236.60/1,853.69 = 619.38/x
  3. Step 3: Cross multiply
    1,236.60x = 1,853.69 × 619.38
  4. Step 4: Simplify right side
    1,236.60x = 1,148,138.51
  5. Step 5: Solve for x
    x = 1,148,138.51/1,236.60
  6. Step 6: Final answer
    x = 928.46

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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.