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Finding the Fourth Proportional to 741.21, 1,022.36 and 492.45

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Solution

The fourth proportional to 741.21, 1,022.36 and 492.45 is: 679.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.21 : 1,022.36 = 492.45 : x
  2. Step 2: Convert to fraction form
    741.21/1,022.36 = 492.45/x
  3. Step 3: Cross multiply
    741.21x = 1,022.36 × 492.45
  4. Step 4: Simplify right side
    741.21x = 503,458.72
  5. Step 5: Solve for x
    x = 503,458.72/741.21
  6. Step 6: Final answer
    x = 679.24

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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.