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Finding the Fourth Proportional to 742.16, 1,111.62 and 727.40

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Solution

The fourth proportional to 742.16, 1,111.62 and 727.40 is: 1,089.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.16 : 1,111.62 = 727.40 : x
  2. Step 2: Convert to fraction form
    742.16/1,111.62 = 727.40/x
  3. Step 3: Cross multiply
    742.16x = 1,111.62 × 727.40
  4. Step 4: Simplify right side
    742.16x = 808,592.39
  5. Step 5: Solve for x
    x = 808,592.39/742.16
  6. Step 6: Final answer
    x = 1,089.51

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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.