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Finding the Fourth Proportional to 1,647.90, 2,273.90 and 939.64

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Solution

The fourth proportional to 1,647.90, 2,273.90 and 939.64 is: 1,296.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,647.90 : 2,273.90 = 939.64 : x
  2. Step 2: Convert to fraction form
    1,647.90/2,273.90 = 939.64/x
  3. Step 3: Cross multiply
    1,647.90x = 2,273.90 × 939.64
  4. Step 4: Simplify right side
    1,647.90x = 2,136,647.40
  5. Step 5: Solve for x
    x = 2,136,647.40/1,647.90
  6. Step 6: Final answer
    x = 1,296.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.