Home / 13,319.87-19,980.79-3,459.20

Finding the Fourth Proportional to 13,319.87, 19,980.79 and 3,459.20

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Solution

The fourth proportional to 13,319.87, 19,980.79 and 3,459.20 is: 5,189.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,319.87 : 19,980.79 = 3,459.20 : x
  2. Step 2: Convert to fraction form
    13,319.87/19,980.79 = 3,459.20/x
  3. Step 3: Cross multiply
    13,319.87x = 19,980.79 × 3,459.20
  4. Step 4: Simplify right side
    13,319.87x = 69,117,440.22
  5. Step 5: Solve for x
    x = 69,117,440.22/13,319.87
  6. Step 6: Final answer
    x = 5,189.05

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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.