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Finding the Fourth Proportional to 13,917.40, 20,897.70 and 8,085.40

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Solution

The fourth proportional to 13,917.40, 20,897.70 and 8,085.40 is: 12,140.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,917.40 : 20,897.70 = 8,085.40 : x
  2. Step 2: Convert to fraction form
    13,917.40/20,897.70 = 8,085.40/x
  3. Step 3: Cross multiply
    13,917.40x = 20,897.70 × 8,085.40
  4. Step 4: Simplify right side
    13,917.40x = 168,966,263.58
  5. Step 5: Solve for x
    x = 168,966,263.58/13,917.40
  6. Step 6: Final answer
    x = 12,140.65

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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.