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Finding the Fourth Proportional to 1,608.94, 2,220.38 and 900.78

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Solution

The fourth proportional to 1,608.94, 2,220.38 and 900.78 is: 1,243.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,608.94 : 2,220.38 = 900.78 : x
  2. Step 2: Convert to fraction form
    1,608.94/2,220.38 = 900.78/x
  3. Step 3: Cross multiply
    1,608.94x = 2,220.38 × 900.78
  4. Step 4: Simplify right side
    1,608.94x = 2,000,072.77
  5. Step 5: Solve for x
    x = 2,000,072.77/1,608.94
  6. Step 6: Final answer
    x = 1,243.10

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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.