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Finding the Fourth Proportional to 1,113.67, 1,536.48 and 720.91

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Solution

The fourth proportional to 1,113.67, 1,536.48 and 720.91 is: 994.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.67 : 1,536.48 = 720.91 : x
  2. Step 2: Convert to fraction form
    1,113.67/1,536.48 = 720.91/x
  3. Step 3: Cross multiply
    1,113.67x = 1,536.48 × 720.91
  4. Step 4: Simplify right side
    1,113.67x = 1,107,663.80
  5. Step 5: Solve for x
    x = 1,107,663.80/1,113.67
  6. Step 6: Final answer
    x = 994.61

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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.