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Finding the Fourth Proportional to 905.18, 1,247.92 and 719.28

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Solution

The fourth proportional to 905.18, 1,247.92 and 719.28 is: 991.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.18 : 1,247.92 = 719.28 : x
  2. Step 2: Convert to fraction form
    905.18/1,247.92 = 719.28/x
  3. Step 3: Cross multiply
    905.18x = 1,247.92 × 719.28
  4. Step 4: Simplify right side
    905.18x = 897,602.10
  5. Step 5: Solve for x
    x = 897,602.10/905.18
  6. Step 6: Final answer
    x = 991.63

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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.