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Finding the Fourth Proportional to 1,113.72, 1,536.99 and 641.64

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Solution

The fourth proportional to 1,113.72, 1,536.99 and 641.64 is: 885.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.72 : 1,536.99 = 641.64 : x
  2. Step 2: Convert to fraction form
    1,113.72/1,536.99 = 641.64/x
  3. Step 3: Cross multiply
    1,113.72x = 1,536.99 × 641.64
  4. Step 4: Simplify right side
    1,113.72x = 986,194.26
  5. Step 5: Solve for x
    x = 986,194.26/1,113.72
  6. Step 6: Final answer
    x = 885.50

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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.