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Finding the Fourth Proportional to 1,579.42, 2,179.56 and 880.78

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Solution

The fourth proportional to 1,579.42, 2,179.56 and 880.78 is: 1,215.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,579.42 : 2,179.56 = 880.78 : x
  2. Step 2: Convert to fraction form
    1,579.42/2,179.56 = 880.78/x
  3. Step 3: Cross multiply
    1,579.42x = 2,179.56 × 880.78
  4. Step 4: Simplify right side
    1,579.42x = 1,919,712.86
  5. Step 5: Solve for x
    x = 1,919,712.86/1,579.42
  6. Step 6: Final answer
    x = 1,215.45

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1.5x scale

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.