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Finding the Fourth Proportional to 1,981.92, 2,973.78 and 812.79

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Solution

The fourth proportional to 1,981.92, 2,973.78 and 812.79 is: 1,219.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.92 : 2,973.78 = 812.79 : x
  2. Step 2: Convert to fraction form
    1,981.92/2,973.78 = 812.79/x
  3. Step 3: Cross multiply
    1,981.92x = 2,973.78 × 812.79
  4. Step 4: Simplify right side
    1,981.92x = 2,417,058.65
  5. Step 5: Solve for x
    x = 2,417,058.65/1,981.92
  6. Step 6: Final answer
    x = 1,219.55

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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.