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Finding the Fourth Proportional to 790.74, 1,090.80 and 603.90

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Solution

The fourth proportional to 790.74, 1,090.80 and 603.90 is: 833.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.74 : 1,090.80 = 603.90 : x
  2. Step 2: Convert to fraction form
    790.74/1,090.80 = 603.90/x
  3. Step 3: Cross multiply
    790.74x = 1,090.80 × 603.90
  4. Step 4: Simplify right side
    790.74x = 658,734.12
  5. Step 5: Solve for x
    x = 658,734.12/790.74
  6. Step 6: Final answer
    x = 833.06

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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.