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Finding the Fourth Proportional to 1,264.05, 1,742.40 and 889.92

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Solution

The fourth proportional to 1,264.05, 1,742.40 and 889.92 is: 1,226.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,264.05 : 1,742.40 = 889.92 : x
  2. Step 2: Convert to fraction form
    1,264.05/1,742.40 = 889.92/x
  3. Step 3: Cross multiply
    1,264.05x = 1,742.40 × 889.92
  4. Step 4: Simplify right side
    1,264.05x = 1,550,596.61
  5. Step 5: Solve for x
    x = 1,550,596.61/1,264.05
  6. Step 6: Final answer
    x = 1,226.69

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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.