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Finding the Fourth Proportional to 13,706.40, 20,559.60 and 9,089.40

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Solution

The fourth proportional to 13,706.40, 20,559.60 and 9,089.40 is: 13,634.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,706.40 : 20,559.60 = 9,089.40 : x
  2. Step 2: Convert to fraction form
    13,706.40/20,559.60 = 9,089.40/x
  3. Step 3: Cross multiply
    13,706.40x = 20,559.60 × 9,089.40
  4. Step 4: Simplify right side
    13,706.40x = 186,874,428.24
  5. Step 5: Solve for x
    x = 186,874,428.24/13,706.40
  6. Step 6: Final answer
    x = 13,634.10

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Double scale
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Similar ratio
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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.