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Finding the Fourth Proportional to 1,579.78, 2,179.74 and 916.48

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Solution

The fourth proportional to 1,579.78, 2,179.74 and 916.48 is: 1,264.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,579.78 : 2,179.74 = 916.48 : x
  2. Step 2: Convert to fraction form
    1,579.78/2,179.74 = 916.48/x
  3. Step 3: Cross multiply
    1,579.78x = 2,179.74 × 916.48
  4. Step 4: Simplify right side
    1,579.78x = 1,997,688.12
  5. Step 5: Solve for x
    x = 1,997,688.12/1,579.78
  6. Step 6: Final answer
    x = 1,264.54

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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.