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Finding the Fourth Proportional to 939.40, 1,405.26 and 694.20

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Solution

The fourth proportional to 939.40, 1,405.26 and 694.20 is: 1,038.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.40 : 1,405.26 = 694.20 : x
  2. Step 2: Convert to fraction form
    939.40/1,405.26 = 694.20/x
  3. Step 3: Cross multiply
    939.40x = 1,405.26 × 694.20
  4. Step 4: Simplify right side
    939.40x = 975,531.49
  5. Step 5: Solve for x
    x = 975,531.49/939.40
  6. Step 6: Final answer
    x = 1,038.46

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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.