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Finding the Fourth Proportional to 741.90, 1,023.81 and 405.80

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Solution

The fourth proportional to 741.90, 1,023.81 and 405.80 is: 560.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.90 : 1,023.81 = 405.80 : x
  2. Step 2: Convert to fraction form
    741.90/1,023.81 = 405.80/x
  3. Step 3: Cross multiply
    741.90x = 1,023.81 × 405.80
  4. Step 4: Simplify right side
    741.90x = 415,462.10
  5. Step 5: Solve for x
    x = 415,462.10/741.90
  6. Step 6: Final answer
    x = 560.00

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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.