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Finding the Fourth Proportional to 1,611.67, 2,417.30 and 638.46

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Solution

The fourth proportional to 1,611.67, 2,417.30 and 638.46 is: 957.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.67 : 2,417.30 = 638.46 : x
  2. Step 2: Convert to fraction form
    1,611.67/2,417.30 = 638.46/x
  3. Step 3: Cross multiply
    1,611.67x = 2,417.30 × 638.46
  4. Step 4: Simplify right side
    1,611.67x = 1,543,349.36
  5. Step 5: Solve for x
    x = 1,543,349.36/1,611.67
  6. Step 6: Final answer
    x = 957.61

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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.