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Finding the Fourth Proportional to 2,213.70, 3,320.55 and 917.70

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Solution

The fourth proportional to 2,213.70, 3,320.55 and 917.70 is: 1,376.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,213.70 : 3,320.55 = 917.70 : x
  2. Step 2: Convert to fraction form
    2,213.70/3,320.55 = 917.70/x
  3. Step 3: Cross multiply
    2,213.70x = 3,320.55 × 917.70
  4. Step 4: Simplify right side
    2,213.70x = 3,047,268.74
  5. Step 5: Solve for x
    x = 3,047,268.74/2,213.70
  6. Step 6: Final answer
    x = 1,376.55

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1.5x scale

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.