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Finding the Fourth Proportional to 742.88, 1,114.32 and 720.31

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Solution

The fourth proportional to 742.88, 1,114.32 and 720.31 is: 1,080.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.88 : 1,114.32 = 720.31 : x
  2. Step 2: Convert to fraction form
    742.88/1,114.32 = 720.31/x
  3. Step 3: Cross multiply
    742.88x = 1,114.32 × 720.31
  4. Step 4: Simplify right side
    742.88x = 802,655.84
  5. Step 5: Solve for x
    x = 802,655.84/742.88
  6. Step 6: Final answer
    x = 1,080.47

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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.