Home / 8,720.20-13,080.28-2,146.40

Finding the Fourth Proportional to 8,720.20, 13,080.28 and 2,146.40

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Solution

The fourth proportional to 8,720.20, 13,080.28 and 2,146.40 is: 3,219.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.20 : 13,080.28 = 2,146.40 : x
  2. Step 2: Convert to fraction form
    8,720.20/13,080.28 = 2,146.40/x
  3. Step 3: Cross multiply
    8,720.20x = 13,080.28 × 2,146.40
  4. Step 4: Simplify right side
    8,720.20x = 28,075,512.99
  5. Step 5: Solve for x
    x = 28,075,512.99/8,720.20
  6. Step 6: Final answer
    x = 3,219.60

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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.