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Finding the Fourth Proportional to 1,396.20, 1,927.38 and 917.64

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Solution

The fourth proportional to 1,396.20, 1,927.38 and 917.64 is: 1,266.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.20 : 1,927.38 = 917.64 : x
  2. Step 2: Convert to fraction form
    1,396.20/1,927.38 = 917.64/x
  3. Step 3: Cross multiply
    1,396.20x = 1,927.38 × 917.64
  4. Step 4: Simplify right side
    1,396.20x = 1,768,640.98
  5. Step 5: Solve for x
    x = 1,768,640.98/1,396.20
  6. Step 6: Final answer
    x = 1,266.75

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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.