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Finding the Fourth Proportional to 1,236.48, 1,855.88 and 651.92

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Solution

The fourth proportional to 1,236.48, 1,855.88 and 651.92 is: 978.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.48 : 1,855.88 = 651.92 : x
  2. Step 2: Convert to fraction form
    1,236.48/1,855.88 = 651.92/x
  3. Step 3: Cross multiply
    1,236.48x = 1,855.88 × 651.92
  4. Step 4: Simplify right side
    1,236.48x = 1,209,872.75
  5. Step 5: Solve for x
    x = 1,209,872.75/1,236.48
  6. Step 6: Final answer
    x = 978.48

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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.