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Finding the Fourth Proportional to 764.21, 1,137.43 and 747.20

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Solution

The fourth proportional to 764.21, 1,137.43 and 747.20 is: 1,112.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.21 : 1,137.43 = 747.20 : x
  2. Step 2: Convert to fraction form
    764.21/1,137.43 = 747.20/x
  3. Step 3: Cross multiply
    764.21x = 1,137.43 × 747.20
  4. Step 4: Simplify right side
    764.21x = 849,887.70
  5. Step 5: Solve for x
    x = 849,887.70/764.21
  6. Step 6: Final answer
    x = 1,112.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.