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Finding the Fourth Proportional to 764.31, 1,145.40 and 688.44

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Solution

The fourth proportional to 764.31, 1,145.40 and 688.44 is: 1,031.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.31 : 1,145.40 = 688.44 : x
  2. Step 2: Convert to fraction form
    764.31/1,145.40 = 688.44/x
  3. Step 3: Cross multiply
    764.31x = 1,145.40 × 688.44
  4. Step 4: Simplify right side
    764.31x = 788,539.18
  5. Step 5: Solve for x
    x = 788,539.18/764.31
  6. Step 6: Final answer
    x = 1,031.70

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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.