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Finding the Fourth Proportional to 1,242.72, 1,714.86 and 889.20

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Solution

The fourth proportional to 1,242.72, 1,714.86 and 889.20 is: 1,227.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.72 : 1,714.86 = 889.20 : x
  2. Step 2: Convert to fraction form
    1,242.72/1,714.86 = 889.20/x
  3. Step 3: Cross multiply
    1,242.72x = 1,714.86 × 889.20
  4. Step 4: Simplify right side
    1,242.72x = 1,524,853.51
  5. Step 5: Solve for x
    x = 1,524,853.51/1,242.72
  6. Step 6: Final answer
    x = 1,227.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.