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Finding the Fourth Proportional to 821.00, 1,228.40 and 474.49

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Solution

The fourth proportional to 821.00, 1,228.40 and 474.49 is: 709.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.00 : 1,228.40 = 474.49 : x
  2. Step 2: Convert to fraction form
    821.00/1,228.40 = 474.49/x
  3. Step 3: Cross multiply
    821.00x = 1,228.40 × 474.49
  4. Step 4: Simplify right side
    821.00x = 582,864.46
  5. Step 5: Solve for x
    x = 582,864.46/821.00
  6. Step 6: Final answer
    x = 709.94

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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.