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Finding the Fourth Proportional to 790.59, 1,185.89 and 213.47

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Solution

The fourth proportional to 790.59, 1,185.89 and 213.47 is: 320.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.59 : 1,185.89 = 213.47 : x
  2. Step 2: Convert to fraction form
    790.59/1,185.89 = 213.47/x
  3. Step 3: Cross multiply
    790.59x = 1,185.89 × 213.47
  4. Step 4: Simplify right side
    790.59x = 253,150.59
  5. Step 5: Solve for x
    x = 253,150.59/790.59
  6. Step 6: Final answer
    x = 320.20

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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.