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Finding the Fourth Proportional to 1,427.68, 2,139.73 and 767.91

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Solution

The fourth proportional to 1,427.68, 2,139.73 and 767.91 is: 1,150.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,427.68 : 2,139.73 = 767.91 : x
  2. Step 2: Convert to fraction form
    1,427.68/2,139.73 = 767.91/x
  3. Step 3: Cross multiply
    1,427.68x = 2,139.73 × 767.91
  4. Step 4: Simplify right side
    1,427.68x = 1,643,130.49
  5. Step 5: Solve for x
    x = 1,643,130.49/1,427.68
  6. Step 6: Final answer
    x = 1,150.91

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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.