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Finding the Fourth Proportional to 1,052.78, 1,451.48 and 720.63

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Solution

The fourth proportional to 1,052.78, 1,451.48 and 720.63 is: 993.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,052.78 : 1,451.48 = 720.63 : x
  2. Step 2: Convert to fraction form
    1,052.78/1,451.48 = 720.63/x
  3. Step 3: Cross multiply
    1,052.78x = 1,451.48 × 720.63
  4. Step 4: Simplify right side
    1,052.78x = 1,045,976.43
  5. Step 5: Solve for x
    x = 1,045,976.43/1,052.78
  6. Step 6: Final answer
    x = 993.54

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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.