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Finding the Fourth Proportional to 13,636.16, 20,455.10 and 3,640.72

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Solution

The fourth proportional to 13,636.16, 20,455.10 and 3,640.72 is: 5,461.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,636.16 : 20,455.10 = 3,640.72 : x
  2. Step 2: Convert to fraction form
    13,636.16/20,455.10 = 3,640.72/x
  3. Step 3: Cross multiply
    13,636.16x = 20,455.10 × 3,640.72
  4. Step 4: Simplify right side
    13,636.16x = 74,471,291.67
  5. Step 5: Solve for x
    x = 74,471,291.67/13,636.16
  6. Step 6: Final answer
    x = 5,461.31

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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.