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Finding the Fourth Proportional to 1,073.66, 1,611.94 and 611.72

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Solution

The fourth proportional to 1,073.66, 1,611.94 and 611.72 is: 918.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,073.66 : 1,611.94 = 611.72 : x
  2. Step 2: Convert to fraction form
    1,073.66/1,611.94 = 611.72/x
  3. Step 3: Cross multiply
    1,073.66x = 1,611.94 × 611.72
  4. Step 4: Simplify right side
    1,073.66x = 986,055.94
  5. Step 5: Solve for x
    x = 986,055.94/1,073.66
  6. Step 6: Final answer
    x = 918.41

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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.