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Finding the Fourth Proportional to 1,946.25, 2,917.60 and 712.78

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Solution

The fourth proportional to 1,946.25, 2,917.60 and 712.78 is: 1,068.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,946.25 : 2,917.60 = 712.78 : x
  2. Step 2: Convert to fraction form
    1,946.25/2,917.60 = 712.78/x
  3. Step 3: Cross multiply
    1,946.25x = 2,917.60 × 712.78
  4. Step 4: Simplify right side
    1,946.25x = 2,079,606.93
  5. Step 5: Solve for x
    x = 2,079,606.93/1,946.25
  6. Step 6: Final answer
    x = 1,068.52

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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.