Home / 13,320.81-19,981.58-3,459.87

Finding the Fourth Proportional to 13,320.81, 19,981.58 and 3,459.87

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Solution

The fourth proportional to 13,320.81, 19,981.58 and 3,459.87 is: 5,189.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,320.81 : 19,981.58 = 3,459.87 : x
  2. Step 2: Convert to fraction form
    13,320.81/19,981.58 = 3,459.87/x
  3. Step 3: Cross multiply
    13,320.81x = 19,981.58 × 3,459.87
  4. Step 4: Simplify right side
    13,320.81x = 69,133,651.90
  5. Step 5: Solve for x
    x = 69,133,651.90/13,320.81
  6. Step 6: Final answer
    x = 5,189.90

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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.