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Finding the Fourth Proportional to 989.22, 1,482.21 and 578.70

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Solution

The fourth proportional to 989.22, 1,482.21 and 578.70 is: 867.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.22 : 1,482.21 = 578.70 : x
  2. Step 2: Convert to fraction form
    989.22/1,482.21 = 578.70/x
  3. Step 3: Cross multiply
    989.22x = 1,482.21 × 578.70
  4. Step 4: Simplify right side
    989.22x = 857,754.93
  5. Step 5: Solve for x
    x = 857,754.93/989.22
  6. Step 6: Final answer
    x = 867.10

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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.