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Finding the Fourth Proportional to 989.14, 1,482.34 and 842.12

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Solution

The fourth proportional to 989.14, 1,482.34 and 842.12 is: 1,262.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.14 : 1,482.34 = 842.12 : x
  2. Step 2: Convert to fraction form
    989.14/1,482.34 = 842.12/x
  3. Step 3: Cross multiply
    989.14x = 1,482.34 × 842.12
  4. Step 4: Simplify right side
    989.14x = 1,248,310.81
  5. Step 5: Solve for x
    x = 1,248,310.81/989.14
  6. Step 6: Final answer
    x = 1,262.02

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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.