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Finding the Fourth Proportional to 893.48, 1,231.84 and 613.20

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Solution

The fourth proportional to 893.48, 1,231.84 and 613.20 is: 845.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.48 : 1,231.84 = 613.20 : x
  2. Step 2: Convert to fraction form
    893.48/1,231.84 = 613.20/x
  3. Step 3: Cross multiply
    893.48x = 1,231.84 × 613.20
  4. Step 4: Simplify right side
    893.48x = 755,364.29
  5. Step 5: Solve for x
    x = 755,364.29/893.48
  6. Step 6: Final answer
    x = 845.42

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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.