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Finding the Fourth Proportional to 1,979.81, 2,969.51 and 518.77

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Solution

The fourth proportional to 1,979.81, 2,969.51 and 518.77 is: 778.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.81 : 2,969.51 = 518.77 : x
  2. Step 2: Convert to fraction form
    1,979.81/2,969.51 = 518.77/x
  3. Step 3: Cross multiply
    1,979.81x = 2,969.51 × 518.77
  4. Step 4: Simplify right side
    1,979.81x = 1,540,482.69
  5. Step 5: Solve for x
    x = 1,540,482.69/1,979.81
  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.