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Finding the Fourth Proportional to 1,484.78, 2,048.96 and 821.61

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Solution

The fourth proportional to 1,484.78, 2,048.96 and 821.61 is: 1,133.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,484.78 : 2,048.96 = 821.61 : x
  2. Step 2: Convert to fraction form
    1,484.78/2,048.96 = 821.61/x
  3. Step 3: Cross multiply
    1,484.78x = 2,048.96 × 821.61
  4. Step 4: Simplify right side
    1,484.78x = 1,683,441.92
  5. Step 5: Solve for x
    x = 1,683,441.92/1,484.78
  6. Step 6: Final answer
    x = 1,133.80

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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.