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Finding the Fourth Proportional to 764.67, 1,056.20 and 753.15

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Solution

The fourth proportional to 764.67, 1,056.20 and 753.15 is: 1,040.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.67 : 1,056.20 = 753.15 : x
  2. Step 2: Convert to fraction form
    764.67/1,056.20 = 753.15/x
  3. Step 3: Cross multiply
    764.67x = 1,056.20 × 753.15
  4. Step 4: Simplify right side
    764.67x = 795,473.26
  5. Step 5: Solve for x
    x = 795,473.26/764.67
  6. Step 6: Final answer
    x = 1,040.28

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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.