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Finding the Fourth Proportional to 790.15, 1,090.10 and 494.90

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Solution

The fourth proportional to 790.15, 1,090.10 and 494.90 is: 682.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.15 : 1,090.10 = 494.90 : x
  2. Step 2: Convert to fraction form
    790.15/1,090.10 = 494.90/x
  3. Step 3: Cross multiply
    790.15x = 1,090.10 × 494.90
  4. Step 4: Simplify right side
    790.15x = 539,488.02
  5. Step 5: Solve for x
    x = 539,488.02/790.15
  6. Step 6: Final answer
    x = 682.77

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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.