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Finding the Fourth Proportional to 790.60, 1,090.34 and 713.80

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Solution

The fourth proportional to 790.60, 1,090.34 and 713.80 is: 984.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.60 : 1,090.34 = 713.80 : x
  2. Step 2: Convert to fraction form
    790.60/1,090.34 = 713.80/x
  3. Step 3: Cross multiply
    790.60x = 1,090.34 × 713.80
  4. Step 4: Simplify right side
    790.60x = 778,284.69
  5. Step 5: Solve for x
    x = 778,284.69/790.60
  6. Step 6: Final answer
    x = 984.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.