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Finding the Fourth Proportional to 742.10, 1,111.46 and 719.28

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Solution

The fourth proportional to 742.10, 1,111.46 and 719.28 is: 1,077.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.10 : 1,111.46 = 719.28 : x
  2. Step 2: Convert to fraction form
    742.10/1,111.46 = 719.28/x
  3. Step 3: Cross multiply
    742.10x = 1,111.46 × 719.28
  4. Step 4: Simplify right side
    742.10x = 799,447.35
  5. Step 5: Solve for x
    x = 799,447.35/742.10
  6. Step 6: Final answer
    x = 1,077.28

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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.