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Finding the Fourth Proportional to 741.79, 1,112.57 and 279.51

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Solution

The fourth proportional to 741.79, 1,112.57 and 279.51 is: 419.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.79 : 1,112.57 = 279.51 : x
  2. Step 2: Convert to fraction form
    741.79/1,112.57 = 279.51/x
  3. Step 3: Cross multiply
    741.79x = 1,112.57 × 279.51
  4. Step 4: Simplify right side
    741.79x = 310,969.92
  5. Step 5: Solve for x
    x = 310,969.92/741.79
  6. Step 6: Final answer
    x = 419.21

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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.