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Finding the Fourth Proportional to 1,167.58, 1,611.19 and 643.61

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Solution

The fourth proportional to 1,167.58, 1,611.19 and 643.61 is: 888.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.58 : 1,611.19 = 643.61 : x
  2. Step 2: Convert to fraction form
    1,167.58/1,611.19 = 643.61/x
  3. Step 3: Cross multiply
    1,167.58x = 1,611.19 × 643.61
  4. Step 4: Simplify right side
    1,167.58x = 1,036,978.00
  5. Step 5: Solve for x
    x = 1,036,978.00/1,167.58
  6. Step 6: Final answer
    x = 888.14

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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.