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Finding the Fourth Proportional to 13,636.40, 20,465.40 and 5,320.40

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Solution

The fourth proportional to 13,636.40, 20,465.40 and 5,320.40 is: 7,984.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,636.40 : 20,465.40 = 5,320.40 : x
  2. Step 2: Convert to fraction form
    13,636.40/20,465.40 = 5,320.40/x
  3. Step 3: Cross multiply
    13,636.40x = 20,465.40 × 5,320.40
  4. Step 4: Simplify right side
    13,636.40x = 108,884,114.16
  5. Step 5: Solve for x
    x = 108,884,114.16/13,636.40
  6. Step 6: Final answer
    x = 7,984.81

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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.