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Finding the Fourth Proportional to 1,053.90, 1,581.21 and 663.45

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Solution

The fourth proportional to 1,053.90, 1,581.21 and 663.45 is: 995.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,053.90 : 1,581.21 = 663.45 : x
  2. Step 2: Convert to fraction form
    1,053.90/1,581.21 = 663.45/x
  3. Step 3: Cross multiply
    1,053.90x = 1,581.21 × 663.45
  4. Step 4: Simplify right side
    1,053.90x = 1,049,042.55
  5. Step 5: Solve for x
    x = 1,049,042.55/1,053.90
  6. Step 6: Final answer
    x = 995.39

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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.