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Finding the Fourth Proportional to 1,579.64, 2,179.36 and 916.28

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Solution

The fourth proportional to 1,579.64, 2,179.36 and 916.28 is: 1,264.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,579.64 : 2,179.36 = 916.28 : x
  2. Step 2: Convert to fraction form
    1,579.64/2,179.36 = 916.28/x
  3. Step 3: Cross multiply
    1,579.64x = 2,179.36 × 916.28
  4. Step 4: Simplify right side
    1,579.64x = 1,996,903.98
  5. Step 5: Solve for x
    x = 1,996,903.98/1,579.64
  6. Step 6: Final answer
    x = 1,264.15

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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.