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Finding the Fourth Proportional to 989.12, 1,482.26 and 727.07

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Solution

The fourth proportional to 989.12, 1,482.26 and 727.07 is: 1,089.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.12 : 1,482.26 = 727.07 : x
  2. Step 2: Convert to fraction form
    989.12/1,482.26 = 727.07/x
  3. Step 3: Cross multiply
    989.12x = 1,482.26 × 727.07
  4. Step 4: Simplify right side
    989.12x = 1,077,706.78
  5. Step 5: Solve for x
    x = 1,077,706.78/989.12
  6. Step 6: Final answer
    x = 1,089.56

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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.