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Finding the Fourth Proportional to 1,167.81, 1,611.55 and 643.85

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Solution

The fourth proportional to 1,167.81, 1,611.55 and 643.85 is: 888.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.81 : 1,611.55 = 643.85 : x
  2. Step 2: Convert to fraction form
    1,167.81/1,611.55 = 643.85/x
  3. Step 3: Cross multiply
    1,167.81x = 1,611.55 × 643.85
  4. Step 4: Simplify right side
    1,167.81x = 1,037,596.47
  5. Step 5: Solve for x
    x = 1,037,596.47/1,167.81
  6. Step 6: Final answer
    x = 888.50

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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.