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Finding the Fourth Proportional to 1,579.55, 2,179.79 and 916.80

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Solution

The fourth proportional to 1,579.55, 2,179.79 and 916.80 is: 1,265.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,579.55 : 2,179.79 = 916.80 : x
  2. Step 2: Convert to fraction form
    1,579.55/2,179.79 = 916.80/x
  3. Step 3: Cross multiply
    1,579.55x = 2,179.79 × 916.80
  4. Step 4: Simplify right side
    1,579.55x = 1,998,431.47
  5. Step 5: Solve for x
    x = 1,998,431.47/1,579.55
  6. Step 6: Final answer
    x = 1,265.19

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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.