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Finding the Fourth Proportional to 913.21, 1,370.86 and 693.29

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Solution

The fourth proportional to 913.21, 1,370.86 and 693.29 is: 1,040.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.21 : 1,370.86 = 693.29 : x
  2. Step 2: Convert to fraction form
    913.21/1,370.86 = 693.29/x
  3. Step 3: Cross multiply
    913.21x = 1,370.86 × 693.29
  4. Step 4: Simplify right side
    913.21x = 950,405.22
  5. Step 5: Solve for x
    x = 950,405.22/913.21
  6. Step 6: Final answer
    x = 1,040.73

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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.