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Finding the Fourth Proportional to 1,380.04, 2,064.99 and 764.34

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Solution

The fourth proportional to 1,380.04, 2,064.99 and 764.34 is: 1,143.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.04 : 2,064.99 = 764.34 : x
  2. Step 2: Convert to fraction form
    1,380.04/2,064.99 = 764.34/x
  3. Step 3: Cross multiply
    1,380.04x = 2,064.99 × 764.34
  4. Step 4: Simplify right side
    1,380.04x = 1,578,349.58
  5. Step 5: Solve for x
    x = 1,578,349.58/1,380.04
  6. Step 6: Final answer
    x = 1,143.70

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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.