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Finding the Fourth Proportional to 1,043.21, 1,561.34 and 878.88

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Solution

The fourth proportional to 1,043.21, 1,561.34 and 878.88 is: 1,315.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.21 : 1,561.34 = 878.88 : x
  2. Step 2: Convert to fraction form
    1,043.21/1,561.34 = 878.88/x
  3. Step 3: Cross multiply
    1,043.21x = 1,561.34 × 878.88
  4. Step 4: Simplify right side
    1,043.21x = 1,372,238.55
  5. Step 5: Solve for x
    x = 1,372,238.55/1,043.21
  6. Step 6: Final answer
    x = 1,315.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.