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Finding the Fourth Proportional to 10,806.40, 16,209.60 and 9,078.40

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Solution

The fourth proportional to 10,806.40, 16,209.60 and 9,078.40 is: 13,617.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,806.40 : 16,209.60 = 9,078.40 : x
  2. Step 2: Convert to fraction form
    10,806.40/16,209.60 = 9,078.40/x
  3. Step 3: Cross multiply
    10,806.40x = 16,209.60 × 9,078.40
  4. Step 4: Simplify right side
    10,806.40x = 147,157,232.64
  5. Step 5: Solve for x
    x = 147,157,232.64/10,806.40
  6. Step 6: Final answer
    x = 13,617.60

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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.