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Finding the Fourth Proportional to 1,167.50, 1,611.15 and 643.55

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Solution

The fourth proportional to 1,167.50, 1,611.15 and 643.55 is: 888.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.50 : 1,611.15 = 643.55 : x
  2. Step 2: Convert to fraction form
    1,167.50/1,611.15 = 643.55/x
  3. Step 3: Cross multiply
    1,167.50x = 1,611.15 × 643.55
  4. Step 4: Simplify right side
    1,167.50x = 1,036,847.53
  5. Step 5: Solve for x
    x = 1,036,847.53/1,167.50
  6. Step 6: Final answer
    x = 888.09

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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.