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Finding the Fourth Proportional to 942.24, 1,302.72 and 720.84

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Solution

The fourth proportional to 942.24, 1,302.72 and 720.84 is: 996.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.24 : 1,302.72 = 720.84 : x
  2. Step 2: Convert to fraction form
    942.24/1,302.72 = 720.84/x
  3. Step 3: Cross multiply
    942.24x = 1,302.72 × 720.84
  4. Step 4: Simplify right side
    942.24x = 939,052.68
  5. Step 5: Solve for x
    x = 939,052.68/942.24
  6. Step 6: Final answer
    x = 996.62

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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.