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Finding the Fourth Proportional to 989.91, 1,482.69 and 816.18

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Solution

The fourth proportional to 989.91, 1,482.69 and 816.18 is: 1,222.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.91 : 1,482.69 = 816.18 : x
  2. Step 2: Convert to fraction form
    989.91/1,482.69 = 816.18/x
  3. Step 3: Cross multiply
    989.91x = 1,482.69 × 816.18
  4. Step 4: Simplify right side
    989.91x = 1,210,141.92
  5. Step 5: Solve for x
    x = 1,210,141.92/989.91
  6. Step 6: Final answer
    x = 1,222.48

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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.