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Finding the Fourth Proportional to 939.15, 1,406.70 and 611.10

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Solution

The fourth proportional to 939.15, 1,406.70 and 611.10 is: 915.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.15 : 1,406.70 = 611.10 : x
  2. Step 2: Convert to fraction form
    939.15/1,406.70 = 611.10/x
  3. Step 3: Cross multiply
    939.15x = 1,406.70 × 611.10
  4. Step 4: Simplify right side
    939.15x = 859,634.37
  5. Step 5: Solve for x
    x = 859,634.37/939.15
  6. Step 6: Final answer
    x = 915.33

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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.