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Finding the Fourth Proportional to 742.10, 1,023.77 and 490.29

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Solution

The fourth proportional to 742.10, 1,023.77 and 490.29 is: 676.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.10 : 1,023.77 = 490.29 : x
  2. Step 2: Convert to fraction form
    742.10/1,023.77 = 490.29/x
  3. Step 3: Cross multiply
    742.10x = 1,023.77 × 490.29
  4. Step 4: Simplify right side
    742.10x = 501,941.58
  5. Step 5: Solve for x
    x = 501,941.58/742.10
  6. Step 6: Final answer
    x = 676.38

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1.5x scale

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.