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Finding the Fourth Proportional to 13,890.80, 20,814.60 and 7,307.12

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Solution

The fourth proportional to 13,890.80, 20,814.60 and 7,307.12 is: 10,949.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,890.80 : 20,814.60 = 7,307.12 : x
  2. Step 2: Convert to fraction form
    13,890.80/20,814.60 = 7,307.12/x
  3. Step 3: Cross multiply
    13,890.80x = 20,814.60 × 7,307.12
  4. Step 4: Simplify right side
    13,890.80x = 152,094,779.95
  5. Step 5: Solve for x
    x = 152,094,779.95/13,890.80
  6. Step 6: Final answer
    x = 10,949.32

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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.