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Finding the Fourth Proportional to 13,630.40, 20,429.40 and 12,237.20

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Solution

The fourth proportional to 13,630.40, 20,429.40 and 12,237.20 is: 18,341.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,630.40 : 20,429.40 = 12,237.20 : x
  2. Step 2: Convert to fraction form
    13,630.40/20,429.40 = 12,237.20/x
  3. Step 3: Cross multiply
    13,630.40x = 20,429.40 × 12,237.20
  4. Step 4: Simplify right side
    13,630.40x = 249,998,653.68
  5. Step 5: Solve for x
    x = 249,998,653.68/13,630.40
  6. Step 6: Final answer
    x = 18,341.26

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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.