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Finding the Fourth Proportional to 1,670.39, 2,505.62 and 939.38

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Solution

The fourth proportional to 1,670.39, 2,505.62 and 939.38 is: 1,409.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,670.39 : 2,505.62 = 939.38 : x
  2. Step 2: Convert to fraction form
    1,670.39/2,505.62 = 939.38/x
  3. Step 3: Cross multiply
    1,670.39x = 2,505.62 × 939.38
  4. Step 4: Simplify right side
    1,670.39x = 2,353,729.32
  5. Step 5: Solve for x
    x = 2,353,729.32/1,670.39
  6. Step 6: Final answer
    x = 1,409.09

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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.