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Finding the Fourth Proportional to 11,990.40, 17,985.60 and 6,806.40

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Solution

The fourth proportional to 11,990.40, 17,985.60 and 6,806.40 is: 10,209.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,990.40 : 17,985.60 = 6,806.40 : x
  2. Step 2: Convert to fraction form
    11,990.40/17,985.60 = 6,806.40/x
  3. Step 3: Cross multiply
    11,990.40x = 17,985.60 × 6,806.40
  4. Step 4: Simplify right side
    11,990.40x = 122,417,187.84
  5. Step 5: Solve for x
    x = 122,417,187.84/11,990.40
  6. Step 6: Final answer
    x = 10,209.60

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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.