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Finding the Fourth Proportional to 1,806.59, 2,493.09 and 978.59

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Solution

The fourth proportional to 1,806.59, 2,493.09 and 978.59 is: 1,350.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,806.59 : 2,493.09 = 978.59 : x
  2. Step 2: Convert to fraction form
    1,806.59/2,493.09 = 978.59/x
  3. Step 3: Cross multiply
    1,806.59x = 2,493.09 × 978.59
  4. Step 4: Simplify right side
    1,806.59x = 2,439,712.94
  5. Step 5: Solve for x
    x = 2,439,712.94/1,806.59
  6. Step 6: Final answer
    x = 1,350.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.