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Finding the Fourth Proportional to 751.92, 1,133.66 and 742.20

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Solution

The fourth proportional to 751.92, 1,133.66 and 742.20 is: 1,119.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.92 : 1,133.66 = 742.20 : x
  2. Step 2: Convert to fraction form
    751.92/1,133.66 = 742.20/x
  3. Step 3: Cross multiply
    751.92x = 1,133.66 × 742.20
  4. Step 4: Simplify right side
    751.92x = 841,398.74
  5. Step 5: Solve for x
    x = 841,398.74/751.92
  6. Step 6: Final answer
    x = 1,119.00

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.