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Finding the Fourth Proportional to 1,354.20, 1,868.91 and 764.85

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Solution

The fourth proportional to 1,354.20, 1,868.91 and 764.85 is: 1,055.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.20 : 1,868.91 = 764.85 : x
  2. Step 2: Convert to fraction form
    1,354.20/1,868.91 = 764.85/x
  3. Step 3: Cross multiply
    1,354.20x = 1,868.91 × 764.85
  4. Step 4: Simplify right side
    1,354.20x = 1,429,435.81
  5. Step 5: Solve for x
    x = 1,429,435.81/1,354.20
  6. Step 6: Final answer
    x = 1,055.56

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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.