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Finding the Fourth Proportional to 885.90, 1,222.83 and 623.98

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Solution

The fourth proportional to 885.90, 1,222.83 and 623.98 is: 861.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.90 : 1,222.83 = 623.98 : x
  2. Step 2: Convert to fraction form
    885.90/1,222.83 = 623.98/x
  3. Step 3: Cross multiply
    885.90x = 1,222.83 × 623.98
  4. Step 4: Simplify right side
    885.90x = 763,021.46
  5. Step 5: Solve for x
    x = 763,021.46/885.90
  6. Step 6: Final answer
    x = 861.30

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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.