Home / 5,129.12-7,075.68-3,139.04

Finding the Fourth Proportional to 5,129.12, 7,075.68 and 3,139.04

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Solution

The fourth proportional to 5,129.12, 7,075.68 and 3,139.04 is: 4,330.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,129.12 : 7,075.68 = 3,139.04 : x
  2. Step 2: Convert to fraction form
    5,129.12/7,075.68 = 3,139.04/x
  3. Step 3: Cross multiply
    5,129.12x = 7,075.68 × 3,139.04
  4. Step 4: Simplify right side
    5,129.12x = 22,210,842.55
  5. Step 5: Solve for x
    x = 22,210,842.55/5,129.12
  6. Step 6: Final answer
    x = 4,330.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.