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Finding the Fourth Proportional to 1,255.45, 1,881.34 and 890.95

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Solution

The fourth proportional to 1,255.45, 1,881.34 and 890.95 is: 1,335.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.45 : 1,881.34 = 890.95 : x
  2. Step 2: Convert to fraction form
    1,255.45/1,881.34 = 890.95/x
  3. Step 3: Cross multiply
    1,255.45x = 1,881.34 × 890.95
  4. Step 4: Simplify right side
    1,255.45x = 1,676,179.87
  5. Step 5: Solve for x
    x = 1,676,179.87/1,255.45
  6. Step 6: Final answer
    x = 1,335.12

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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.