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Finding the Fourth Proportional to 13,977.20, 20,990.10 and 7,416.20

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Solution

The fourth proportional to 13,977.20, 20,990.10 and 7,416.20 is: 11,137.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,977.20 : 20,990.10 = 7,416.20 : x
  2. Step 2: Convert to fraction form
    13,977.20/20,990.10 = 7,416.20/x
  3. Step 3: Cross multiply
    13,977.20x = 20,990.10 × 7,416.20
  4. Step 4: Simplify right side
    13,977.20x = 155,666,779.62
  5. Step 5: Solve for x
    x = 155,666,779.62/13,977.20
  6. Step 6: Final answer
    x = 11,137.19

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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.