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Finding the Fourth Proportional to 741.45, 1,023.20 and 409.90

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Solution

The fourth proportional to 741.45, 1,023.20 and 409.90 is: 565.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.45 : 1,023.20 = 409.90 : x
  2. Step 2: Convert to fraction form
    741.45/1,023.20 = 409.90/x
  3. Step 3: Cross multiply
    741.45x = 1,023.20 × 409.90
  4. Step 4: Simplify right side
    741.45x = 419,407.63
  5. Step 5: Solve for x
    x = 419,407.63/741.45
  6. Step 6: Final answer
    x = 565.66

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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.