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Finding the Fourth Proportional to 749.76, 1,131.36 and 719.79

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Solution

The fourth proportional to 749.76, 1,131.36 and 719.79 is: 1,086.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.76 : 1,131.36 = 719.79 : x
  2. Step 2: Convert to fraction form
    749.76/1,131.36 = 719.79/x
  3. Step 3: Cross multiply
    749.76x = 1,131.36 × 719.79
  4. Step 4: Simplify right side
    749.76x = 814,341.61
  5. Step 5: Solve for x
    x = 814,341.61/749.76
  6. Step 6: Final answer
    x = 1,086.14

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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.