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Finding the Fourth Proportional to 1,188.61, 1,782.20 and 881.21

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Solution

The fourth proportional to 1,188.61, 1,782.20 and 881.21 is: 1,321.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.61 : 1,782.20 = 881.21 : x
  2. Step 2: Convert to fraction form
    1,188.61/1,782.20 = 881.21/x
  3. Step 3: Cross multiply
    1,188.61x = 1,782.20 × 881.21
  4. Step 4: Simplify right side
    1,188.61x = 1,570,499.12
  5. Step 5: Solve for x
    x = 1,570,499.12/1,188.61
  6. Step 6: Final answer
    x = 1,321.29

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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.