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Finding the Fourth Proportional to 1,411.06, 1,946.97 and 821.56

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Solution

The fourth proportional to 1,411.06, 1,946.97 and 821.56 is: 1,133.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,411.06 : 1,946.97 = 821.56 : x
  2. Step 2: Convert to fraction form
    1,411.06/1,946.97 = 821.56/x
  3. Step 3: Cross multiply
    1,411.06x = 1,946.97 × 821.56
  4. Step 4: Simplify right side
    1,411.06x = 1,599,552.67
  5. Step 5: Solve for x
    x = 1,599,552.67/1,411.06
  6. Step 6: Final answer
    x = 1,133.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.