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Finding the Fourth Proportional to 13,487.68, 20,189.64 and 12,339.40

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Solution

The fourth proportional to 13,487.68, 20,189.64 and 12,339.40 is: 18,470.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,487.68 : 20,189.64 = 12,339.40 : x
  2. Step 2: Convert to fraction form
    13,487.68/20,189.64 = 12,339.40/x
  3. Step 3: Cross multiply
    13,487.68x = 20,189.64 × 12,339.40
  4. Step 4: Simplify right side
    13,487.68x = 249,128,043.82
  5. Step 5: Solve for x
    x = 249,128,043.82/13,487.68
  6. Step 6: Final answer
    x = 18,470.79

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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.