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Finding the Fourth Proportional to 1,244.05, 1,866.09 and 978.87

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Solution

The fourth proportional to 1,244.05, 1,866.09 and 978.87 is: 1,468.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,244.05 : 1,866.09 = 978.87 : x
  2. Step 2: Convert to fraction form
    1,244.05/1,866.09 = 978.87/x
  3. Step 3: Cross multiply
    1,244.05x = 1,866.09 × 978.87
  4. Step 4: Simplify right side
    1,244.05x = 1,826,670.19
  5. Step 5: Solve for x
    x = 1,826,670.19/1,244.05
  6. Step 6: Final answer
    x = 1,468.33

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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.