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Finding the Fourth Proportional to 1,272.45, 1,905.58 and 881.33

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Solution

The fourth proportional to 1,272.45, 1,905.58 and 881.33 is: 1,319.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.45 : 1,905.58 = 881.33 : x
  2. Step 2: Convert to fraction form
    1,272.45/1,905.58 = 881.33/x
  3. Step 3: Cross multiply
    1,272.45x = 1,905.58 × 881.33
  4. Step 4: Simplify right side
    1,272.45x = 1,679,442.16
  5. Step 5: Solve for x
    x = 1,679,442.16/1,272.45
  6. Step 6: Final answer
    x = 1,319.85

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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.