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Finding the Fourth Proportional to 821.80, 1,230.30 and 735.40

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Solution

The fourth proportional to 821.80, 1,230.30 and 735.40 is: 1,100.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.80 : 1,230.30 = 735.40 : x
  2. Step 2: Convert to fraction form
    821.80/1,230.30 = 735.40/x
  3. Step 3: Cross multiply
    821.80x = 1,230.30 × 735.40
  4. Step 4: Simplify right side
    821.80x = 904,762.62
  5. Step 5: Solve for x
    x = 904,762.62/821.80
  6. Step 6: Final answer
    x = 1,100.95

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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.