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Finding the Fourth Proportional to 764.34, 1,057.56 and 666.30

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Solution

The fourth proportional to 764.34, 1,057.56 and 666.30 is: 921.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.34 : 1,057.56 = 666.30 : x
  2. Step 2: Convert to fraction form
    764.34/1,057.56 = 666.30/x
  3. Step 3: Cross multiply
    764.34x = 1,057.56 × 666.30
  4. Step 4: Simplify right side
    764.34x = 704,652.23
  5. Step 5: Solve for x
    x = 704,652.23/764.34
  6. Step 6: Final answer
    x = 921.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.