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Finding the Fourth Proportional to 892.15, 1,231.20 and 623.03

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Solution

The fourth proportional to 892.15, 1,231.20 and 623.03 is: 859.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.15 : 1,231.20 = 623.03 : x
  2. Step 2: Convert to fraction form
    892.15/1,231.20 = 623.03/x
  3. Step 3: Cross multiply
    892.15x = 1,231.20 × 623.03
  4. Step 4: Simplify right side
    892.15x = 767,068.38
  5. Step 5: Solve for x
    x = 767,068.38/892.15
  6. Step 6: Final answer
    x = 859.80

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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.