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Finding the Fourth Proportional to 1,178.16, 1,765.56 and 889.80

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Solution

The fourth proportional to 1,178.16, 1,765.56 and 889.80 is: 1,333.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.16 : 1,765.56 = 889.80 : x
  2. Step 2: Convert to fraction form
    1,178.16/1,765.56 = 889.80/x
  3. Step 3: Cross multiply
    1,178.16x = 1,765.56 × 889.80
  4. Step 4: Simplify right side
    1,178.16x = 1,570,995.29
  5. Step 5: Solve for x
    x = 1,570,995.29/1,178.16
  6. Step 6: Final answer
    x = 1,333.43

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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.