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Finding the Fourth Proportional to 1,192.80, 1,788 and 543.20

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Solution

The fourth proportional to 1,192.80, 1,788 and 543.20 is: 814.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.80 : 1,788 = 543.20 : x
  2. Step 2: Convert to fraction form
    1,192.80/1,788 = 543.20/x
  3. Step 3: Cross multiply
    1,192.80x = 1,788 × 543.20
  4. Step 4: Simplify right side
    1,192.80x = 971,241.60
  5. Step 5: Solve for x
    x = 971,241.60/1,192.80
  6. Step 6: Final answer
    x = 814.25

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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.