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Finding the Fourth Proportional to 790.90, 1,091.29 and 459.21

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Solution

The fourth proportional to 790.90, 1,091.29 and 459.21 is: 633.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.90 : 1,091.29 = 459.21 : x
  2. Step 2: Convert to fraction form
    790.90/1,091.29 = 459.21/x
  3. Step 3: Cross multiply
    790.90x = 1,091.29 × 459.21
  4. Step 4: Simplify right side
    790.90x = 501,131.28
  5. Step 5: Solve for x
    x = 501,131.28/790.90
  6. Step 6: Final answer
    x = 633.62

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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.