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Finding the Fourth Proportional to 741.12, 1,111.78 and 411.81

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Solution

The fourth proportional to 741.12, 1,111.78 and 411.81 is: 617.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.12 : 1,111.78 = 411.81 : x
  2. Step 2: Convert to fraction form
    741.12/1,111.78 = 411.81/x
  3. Step 3: Cross multiply
    741.12x = 1,111.78 × 411.81
  4. Step 4: Simplify right side
    741.12x = 457,842.12
  5. Step 5: Solve for x
    x = 457,842.12/741.12
  6. Step 6: Final answer
    x = 617.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.