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Finding the Fourth Proportional to 8,720.80, 13,075.80 and 5,021.20

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Solution

The fourth proportional to 8,720.80, 13,075.80 and 5,021.20 is: 7,528.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.80 : 13,075.80 = 5,021.20 : x
  2. Step 2: Convert to fraction form
    8,720.80/13,075.80 = 5,021.20/x
  3. Step 3: Cross multiply
    8,720.80x = 13,075.80 × 5,021.20
  4. Step 4: Simplify right side
    8,720.80x = 65,656,206.96
  5. Step 5: Solve for x
    x = 65,656,206.96/8,720.80
  6. Step 6: Final answer
    x = 7,528.69

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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.