Home / 3,318.58-4,977.23-978.69

Finding the Fourth Proportional to 3,318.58, 4,977.23 and 978.69

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Solution

The fourth proportional to 3,318.58, 4,977.23 and 978.69 is: 1,467.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,318.58 : 4,977.23 = 978.69 : x
  2. Step 2: Convert to fraction form
    3,318.58/4,977.23 = 978.69/x
  3. Step 3: Cross multiply
    3,318.58x = 4,977.23 × 978.69
  4. Step 4: Simplify right side
    3,318.58x = 4,871,174.64
  5. Step 5: Solve for x
    x = 4,871,174.64/3,318.58
  6. Step 6: Final answer
    x = 1,467.85

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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.