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Finding the Fourth Proportional to 985.03, 1,478.86 and 779.83

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Solution

The fourth proportional to 985.03, 1,478.86 and 779.83 is: 1,170.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.03 : 1,478.86 = 779.83 : x
  2. Step 2: Convert to fraction form
    985.03/1,478.86 = 779.83/x
  3. Step 3: Cross multiply
    985.03x = 1,478.86 × 779.83
  4. Step 4: Simplify right side
    985.03x = 1,153,253.75
  5. Step 5: Solve for x
    x = 1,153,253.75/985.03
  6. Step 6: Final answer
    x = 1,170.78

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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.