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Finding the Fourth Proportional to 1,049.64, 1,447.74 and 717.72

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Solution

The fourth proportional to 1,049.64, 1,447.74 and 717.72 is: 989.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,049.64 : 1,447.74 = 717.72 : x
  2. Step 2: Convert to fraction form
    1,049.64/1,447.74 = 717.72/x
  3. Step 3: Cross multiply
    1,049.64x = 1,447.74 × 717.72
  4. Step 4: Simplify right side
    1,049.64x = 1,039,071.95
  5. Step 5: Solve for x
    x = 1,039,071.95/1,049.64
  6. Step 6: Final answer
    x = 989.93

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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.