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Finding the Fourth Proportional to 1,312.31, 1,966.44 and 764.75

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Solution

The fourth proportional to 1,312.31, 1,966.44 and 764.75 is: 1,145.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.31 : 1,966.44 = 764.75 : x
  2. Step 2: Convert to fraction form
    1,312.31/1,966.44 = 764.75/x
  3. Step 3: Cross multiply
    1,312.31x = 1,966.44 × 764.75
  4. Step 4: Simplify right side
    1,312.31x = 1,503,834.99
  5. Step 5: Solve for x
    x = 1,503,834.99/1,312.31
  6. Step 6: Final answer
    x = 1,145.94

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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.