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Finding the Fourth Proportional to 790.85, 1,091.28 and 459.21

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Solution

The fourth proportional to 790.85, 1,091.28 and 459.21 is: 633.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.85 : 1,091.28 = 459.21 : x
  2. Step 2: Convert to fraction form
    790.85/1,091.28 = 459.21/x
  3. Step 3: Cross multiply
    790.85x = 1,091.28 × 459.21
  4. Step 4: Simplify right side
    790.85x = 501,126.69
  5. Step 5: Solve for x
    x = 501,126.69/790.85
  6. Step 6: Final answer
    x = 633.66

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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.