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Finding the Fourth Proportional to 989.84, 1,367.24 and 858.80

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Solution

The fourth proportional to 989.84, 1,367.24 and 858.80 is: 1,186.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.84 : 1,367.24 = 858.80 : x
  2. Step 2: Convert to fraction form
    989.84/1,367.24 = 858.80/x
  3. Step 3: Cross multiply
    989.84x = 1,367.24 × 858.80
  4. Step 4: Simplify right side
    989.84x = 1,174,185.71
  5. Step 5: Solve for x
    x = 1,174,185.71/989.84
  6. Step 6: Final answer
    x = 1,186.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.