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Finding the Fourth Proportional to 10,990.80, 16,448.40 and 6,611.40

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Solution

The fourth proportional to 10,990.80, 16,448.40 and 6,611.40 is: 9,894.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,990.80 : 16,448.40 = 6,611.40 : x
  2. Step 2: Convert to fraction form
    10,990.80/16,448.40 = 6,611.40/x
  3. Step 3: Cross multiply
    10,990.80x = 16,448.40 × 6,611.40
  4. Step 4: Simplify right side
    10,990.80x = 108,746,951.76
  5. Step 5: Solve for x
    x = 108,746,951.76/10,990.80
  6. Step 6: Final answer
    x = 9,894.36

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1.5x scale

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.