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Finding the Fourth Proportional to 942.14, 1,298.56 and 720.61

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Solution

The fourth proportional to 942.14, 1,298.56 and 720.61 is: 993.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.14 : 1,298.56 = 720.61 : x
  2. Step 2: Convert to fraction form
    942.14/1,298.56 = 720.61/x
  3. Step 3: Cross multiply
    942.14x = 1,298.56 × 720.61
  4. Step 4: Simplify right side
    942.14x = 935,755.32
  5. Step 5: Solve for x
    x = 935,755.32/942.14
  6. Step 6: Final answer
    x = 993.22

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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.