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Finding the Fourth Proportional to 1,946.81, 2,921.13 and 851.49

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Solution

The fourth proportional to 1,946.81, 2,921.13 and 851.49 is: 1,277.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,946.81 : 2,921.13 = 851.49 : x
  2. Step 2: Convert to fraction form
    1,946.81/2,921.13 = 851.49/x
  3. Step 3: Cross multiply
    1,946.81x = 2,921.13 × 851.49
  4. Step 4: Simplify right side
    1,946.81x = 2,487,312.98
  5. Step 5: Solve for x
    x = 2,487,312.98/1,946.81
  6. Step 6: Final answer
    x = 1,277.63

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Double scale
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1.5x scale

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.