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Finding the Fourth Proportional to 1,992.76, 2,990.40 and 760.30

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Solution

The fourth proportional to 1,992.76, 2,990.40 and 760.30 is: 1,140.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.76 : 2,990.40 = 760.30 : x
  2. Step 2: Convert to fraction form
    1,992.76/2,990.40 = 760.30/x
  3. Step 3: Cross multiply
    1,992.76x = 2,990.40 × 760.30
  4. Step 4: Simplify right side
    1,992.76x = 2,273,601.12
  5. Step 5: Solve for x
    x = 2,273,601.12/1,992.76
  6. Step 6: Final answer
    x = 1,140.93

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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.