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Finding the Fourth Proportional to 1,255.40, 1,884.90 and 891.80

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Solution

The fourth proportional to 1,255.40, 1,884.90 and 891.80 is: 1,338.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.40 : 1,884.90 = 891.80 : x
  2. Step 2: Convert to fraction form
    1,255.40/1,884.90 = 891.80/x
  3. Step 3: Cross multiply
    1,255.40x = 1,884.90 × 891.80
  4. Step 4: Simplify right side
    1,255.40x = 1,680,953.82
  5. Step 5: Solve for x
    x = 1,680,953.82/1,255.40
  6. Step 6: Final answer
    x = 1,338.98

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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.