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Finding the Fourth Proportional to 1,131.42, 1,695.96 and 643.44

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Solution

The fourth proportional to 1,131.42, 1,695.96 and 643.44 is: 964.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.42 : 1,695.96 = 643.44 : x
  2. Step 2: Convert to fraction form
    1,131.42/1,695.96 = 643.44/x
  3. Step 3: Cross multiply
    1,131.42x = 1,695.96 × 643.44
  4. Step 4: Simplify right side
    1,131.42x = 1,091,248.50
  5. Step 5: Solve for x
    x = 1,091,248.50/1,131.42
  6. Step 6: Final answer
    x = 964.49

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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.