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Finding the Fourth Proportional to 2,990.65, 4,485.96 and 910.65

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Solution

The fourth proportional to 2,990.65, 4,485.96 and 910.65 is: 1,365.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.65 : 4,485.96 = 910.65 : x
  2. Step 2: Convert to fraction form
    2,990.65/4,485.96 = 910.65/x
  3. Step 3: Cross multiply
    2,990.65x = 4,485.96 × 910.65
  4. Step 4: Simplify right side
    2,990.65x = 4,085,139.47
  5. Step 5: Solve for x
    x = 4,085,139.47/2,990.65
  6. Step 6: Final answer
    x = 1,365.97

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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.