Home / 1,979.55-2,969.50-518.70

Finding the Fourth Proportional to 1,979.55, 2,969.50 and 518.70

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Solution

The fourth proportional to 1,979.55, 2,969.50 and 518.70 is: 778.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.55 : 2,969.50 = 518.70 : x
  2. Step 2: Convert to fraction form
    1,979.55/2,969.50 = 518.70/x
  3. Step 3: Cross multiply
    1,979.55x = 2,969.50 × 518.70
  4. Step 4: Simplify right side
    1,979.55x = 1,540,284.48
  5. Step 5: Solve for x
    x = 1,540,284.48/1,979.55
  6. Step 6: Final answer
    x = 778.10

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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.