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Finding the Fourth Proportional to 793.08, 1,087.20 and 780.32

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Solution

The fourth proportional to 793.08, 1,087.20 and 780.32 is: 1,069.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.08 : 1,087.20 = 780.32 : x
  2. Step 2: Convert to fraction form
    793.08/1,087.20 = 780.32/x
  3. Step 3: Cross multiply
    793.08x = 1,087.20 × 780.32
  4. Step 4: Simplify right side
    793.08x = 848,358.47
  5. Step 5: Solve for x
    x = 848,358.47/793.08
  6. Step 6: Final answer
    x = 1,069.70

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.