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Finding the Fourth Proportional to 1,964.26, 2,946.57 and 989.74

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Solution

The fourth proportional to 1,964.26, 2,946.57 and 989.74 is: 1,484.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,964.26 : 2,946.57 = 989.74 : x
  2. Step 2: Convert to fraction form
    1,964.26/2,946.57 = 989.74/x
  3. Step 3: Cross multiply
    1,964.26x = 2,946.57 × 989.74
  4. Step 4: Simplify right side
    1,964.26x = 2,916,338.19
  5. Step 5: Solve for x
    x = 2,916,338.19/1,964.26
  6. Step 6: Final answer
    x = 1,484.70

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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.