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Finding the Fourth Proportional to 978.19, 1,350.52 and 873.09

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Solution

The fourth proportional to 978.19, 1,350.52 and 873.09 is: 1,205.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.19 : 1,350.52 = 873.09 : x
  2. Step 2: Convert to fraction form
    978.19/1,350.52 = 873.09/x
  3. Step 3: Cross multiply
    978.19x = 1,350.52 × 873.09
  4. Step 4: Simplify right side
    978.19x = 1,179,125.51
  5. Step 5: Solve for x
    x = 1,179,125.51/978.19
  6. Step 6: Final answer
    x = 1,205.42

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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.