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Finding the Fourth Proportional to 1,377, 1,901.61 and 979.56

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Solution

The fourth proportional to 1,377, 1,901.61 and 979.56 is: 1,352.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377 : 1,901.61 = 979.56 : x
  2. Step 2: Convert to fraction form
    1,377/1,901.61 = 979.56/x
  3. Step 3: Cross multiply
    1,377x = 1,901.61 × 979.56
  4. Step 4: Simplify right side
    1,377x = 1,862,741.09
  5. Step 5: Solve for x
    x = 1,862,741.09/1,377
  6. Step 6: Final answer
    x = 1,352.75

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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.