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Finding the Fourth Proportional to 764.30, 1,146.99 and 690.86

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Solution

The fourth proportional to 764.30, 1,146.99 and 690.86 is: 1,036.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.30 : 1,146.99 = 690.86 : x
  2. Step 2: Convert to fraction form
    764.30/1,146.99 = 690.86/x
  3. Step 3: Cross multiply
    764.30x = 1,146.99 × 690.86
  4. Step 4: Simplify right side
    764.30x = 792,409.51
  5. Step 5: Solve for x
    x = 792,409.51/764.30
  6. Step 6: Final answer
    x = 1,036.78

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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.