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Finding the Fourth Proportional to 790.36, 1,185.30 and 517.90

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Solution

The fourth proportional to 790.36, 1,185.30 and 517.90 is: 776.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.36 : 1,185.30 = 517.90 : x
  2. Step 2: Convert to fraction form
    790.36/1,185.30 = 517.90/x
  3. Step 3: Cross multiply
    790.36x = 1,185.30 × 517.90
  4. Step 4: Simplify right side
    790.36x = 613,866.87
  5. Step 5: Solve for x
    x = 613,866.87/790.36
  6. Step 6: Final answer
    x = 776.69

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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.