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Finding the Fourth Proportional to 790.22, 1,090.40 and 454.11

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Solution

The fourth proportional to 790.22, 1,090.40 and 454.11 is: 626.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.22 : 1,090.40 = 454.11 : x
  2. Step 2: Convert to fraction form
    790.22/1,090.40 = 454.11/x
  3. Step 3: Cross multiply
    790.22x = 1,090.40 × 454.11
  4. Step 4: Simplify right side
    790.22x = 495,159.02
  5. Step 5: Solve for x
    x = 495,159.02/790.22
  6. Step 6: Final answer
    x = 626.61

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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.