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Finding the Fourth Proportional to 693.44, 1,040.21 and 231.20

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Solution

The fourth proportional to 693.44, 1,040.21 and 231.20 is: 346.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.44 : 1,040.21 = 231.20 : x
  2. Step 2: Convert to fraction form
    693.44/1,040.21 = 231.20/x
  3. Step 3: Cross multiply
    693.44x = 1,040.21 × 231.20
  4. Step 4: Simplify right side
    693.44x = 240,495.40
  5. Step 5: Solve for x
    x = 240,495.40/693.44
  6. Step 6: Final answer
    x = 346.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.