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Finding the Fourth Proportional to 741.78, 1,023.78 and 431.28

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Solution

The fourth proportional to 741.78, 1,023.78 and 431.28 is: 595.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.78 : 1,023.78 = 431.28 : x
  2. Step 2: Convert to fraction form
    741.78/1,023.78 = 431.28/x
  3. Step 3: Cross multiply
    741.78x = 1,023.78 × 431.28
  4. Step 4: Simplify right side
    741.78x = 441,535.84
  5. Step 5: Solve for x
    x = 441,535.84/741.78
  6. Step 6: Final answer
    x = 595.24

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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.