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Finding the Fourth Proportional to 883.84, 1,220 and 621.92

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Solution

The fourth proportional to 883.84, 1,220 and 621.92 is: 858.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.84 : 1,220 = 621.92 : x
  2. Step 2: Convert to fraction form
    883.84/1,220 = 621.92/x
  3. Step 3: Cross multiply
    883.84x = 1,220 × 621.92
  4. Step 4: Simplify right side
    883.84x = 758,742.40
  5. Step 5: Solve for x
    x = 758,742.40/883.84
  6. Step 6: Final answer
    x = 858.46

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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.