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Finding the Fourth Proportional to 1,611.96, 2,417.94 and 687.30

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Solution

The fourth proportional to 1,611.96, 2,417.94 and 687.30 is: 1,030.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.96 : 2,417.94 = 687.30 : x
  2. Step 2: Convert to fraction form
    1,611.96/2,417.94 = 687.30/x
  3. Step 3: Cross multiply
    1,611.96x = 2,417.94 × 687.30
  4. Step 4: Simplify right side
    1,611.96x = 1,661,850.16
  5. Step 5: Solve for x
    x = 1,661,850.16/1,611.96
  6. Step 6: Final answer
    x = 1,030.95

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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.