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Finding the Fourth Proportional to 822.24, 1,229.40 and 802.80

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Solution

The fourth proportional to 822.24, 1,229.40 and 802.80 is: 1,200.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.24 : 1,229.40 = 802.80 : x
  2. Step 2: Convert to fraction form
    822.24/1,229.40 = 802.80/x
  3. Step 3: Cross multiply
    822.24x = 1,229.40 × 802.80
  4. Step 4: Simplify right side
    822.24x = 986,962.32
  5. Step 5: Solve for x
    x = 986,962.32/822.24
  6. Step 6: Final answer
    x = 1,200.33

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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.