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Finding the Fourth Proportional to 883.90, 1,220.07 and 621.98

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Solution

The fourth proportional to 883.90, 1,220.07 and 621.98 is: 858.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.90 : 1,220.07 = 621.98 : x
  2. Step 2: Convert to fraction form
    883.90/1,220.07 = 621.98/x
  3. Step 3: Cross multiply
    883.90x = 1,220.07 × 621.98
  4. Step 4: Simplify right side
    883.90x = 758,859.14
  5. Step 5: Solve for x
    x = 758,859.14/883.90
  6. Step 6: Final answer
    x = 858.54

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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.