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Finding the Fourth Proportional to 1,113.91, 1,536.60 and 720.25

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Solution

The fourth proportional to 1,113.91, 1,536.60 and 720.25 is: 993.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.91 : 1,536.60 = 720.25 : x
  2. Step 2: Convert to fraction form
    1,113.91/1,536.60 = 720.25/x
  3. Step 3: Cross multiply
    1,113.91x = 1,536.60 × 720.25
  4. Step 4: Simplify right side
    1,113.91x = 1,106,736.15
  5. Step 5: Solve for x
    x = 1,106,736.15/1,113.91
  6. Step 6: Final answer
    x = 993.56

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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.