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Finding the Fourth Proportional to 741.50, 1,023.25 and 405.40

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Solution

The fourth proportional to 741.50, 1,023.25 and 405.40 is: 559.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.50 : 1,023.25 = 405.40 : x
  2. Step 2: Convert to fraction form
    741.50/1,023.25 = 405.40/x
  3. Step 3: Cross multiply
    741.50x = 1,023.25 × 405.40
  4. Step 4: Simplify right side
    741.50x = 414,825.55
  5. Step 5: Solve for x
    x = 414,825.55/741.50
  6. Step 6: Final answer
    x = 559.44

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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.