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Finding the Fourth Proportional to 561.36, 840.74 and 329.79

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Solution

The fourth proportional to 561.36, 840.74 and 329.79 is: 493.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.36 : 840.74 = 329.79 : x
  2. Step 2: Convert to fraction form
    561.36/840.74 = 329.79/x
  3. Step 3: Cross multiply
    561.36x = 840.74 × 329.79
  4. Step 4: Simplify right side
    561.36x = 277,266.00
  5. Step 5: Solve for x
    x = 277,266.00/561.36
  6. Step 6: Final answer
    x = 493.92

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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.