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Finding the Fourth Proportional to 903.18, 1,245.96 and 623.79

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Solution

The fourth proportional to 903.18, 1,245.96 and 623.79 is: 860.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.18 : 1,245.96 = 623.79 : x
  2. Step 2: Convert to fraction form
    903.18/1,245.96 = 623.79/x
  3. Step 3: Cross multiply
    903.18x = 1,245.96 × 623.79
  4. Step 4: Simplify right side
    903.18x = 777,217.39
  5. Step 5: Solve for x
    x = 777,217.39/903.18
  6. Step 6: Final answer
    x = 860.53

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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.