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Finding the Fourth Proportional to 812.02, 1,217.93 and 478.66

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Solution

The fourth proportional to 812.02, 1,217.93 and 478.66 is: 717.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.02 : 1,217.93 = 478.66 : x
  2. Step 2: Convert to fraction form
    812.02/1,217.93 = 478.66/x
  3. Step 3: Cross multiply
    812.02x = 1,217.93 × 478.66
  4. Step 4: Simplify right side
    812.02x = 582,968.94
  5. Step 5: Solve for x
    x = 582,968.94/812.02
  6. Step 6: Final answer
    x = 717.93

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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.