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Finding the Fourth Proportional to 3,572.90, 4,930.49 and 1,979.49

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Solution

The fourth proportional to 3,572.90, 4,930.49 and 1,979.49 is: 2,731.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,572.90 : 4,930.49 = 1,979.49 : x
  2. Step 2: Convert to fraction form
    3,572.90/4,930.49 = 1,979.49/x
  3. Step 3: Cross multiply
    3,572.90x = 4,930.49 × 1,979.49
  4. Step 4: Simplify right side
    3,572.90x = 9,759,821.10
  5. Step 5: Solve for x
    x = 9,759,821.10/3,572.90
  6. Step 6: Final answer
    x = 2,731.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.