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Finding the Fourth Proportional to 989.26, 1,484.07 and 785.14

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Solution

The fourth proportional to 989.26, 1,484.07 and 785.14 is: 1,177.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.26 : 1,484.07 = 785.14 : x
  2. Step 2: Convert to fraction form
    989.26/1,484.07 = 785.14/x
  3. Step 3: Cross multiply
    989.26x = 1,484.07 × 785.14
  4. Step 4: Simplify right side
    989.26x = 1,165,202.72
  5. Step 5: Solve for x
    x = 1,165,202.72/989.26
  6. Step 6: Final answer
    x = 1,177.85

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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.