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Finding the Fourth Proportional to 1,693.85, 2,542.05 and 720.63

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Solution

The fourth proportional to 1,693.85, 2,542.05 and 720.63 is: 1,081.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,693.85 : 2,542.05 = 720.63 : x
  2. Step 2: Convert to fraction form
    1,693.85/2,542.05 = 720.63/x
  3. Step 3: Cross multiply
    1,693.85x = 2,542.05 × 720.63
  4. Step 4: Simplify right side
    1,693.85x = 1,831,877.49
  5. Step 5: Solve for x
    x = 1,831,877.49/1,693.85
  6. Step 6: Final answer
    x = 1,081.49

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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.