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Finding the Fourth Proportional to 1,018.62, 1,531.44 and 891.18

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Solution

The fourth proportional to 1,018.62, 1,531.44 and 891.18 is: 1,339.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.62 : 1,531.44 = 891.18 : x
  2. Step 2: Convert to fraction form
    1,018.62/1,531.44 = 891.18/x
  3. Step 3: Cross multiply
    1,018.62x = 1,531.44 × 891.18
  4. Step 4: Simplify right side
    1,018.62x = 1,364,788.70
  5. Step 5: Solve for x
    x = 1,364,788.70/1,018.62
  6. Step 6: Final answer
    x = 1,339.84

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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.