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Finding the Fourth Proportional to 1,074.40, 1,611.20 and 424.64

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Solution

The fourth proportional to 1,074.40, 1,611.20 and 424.64 is: 636.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.40 : 1,611.20 = 424.64 : x
  2. Step 2: Convert to fraction form
    1,074.40/1,611.20 = 424.64/x
  3. Step 3: Cross multiply
    1,074.40x = 1,611.20 × 424.64
  4. Step 4: Simplify right side
    1,074.40x = 684,179.97
  5. Step 5: Solve for x
    x = 684,179.97/1,074.40
  6. Step 6: Final answer
    x = 636.80

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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.