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Finding the Fourth Proportional to 1,608.66, 2,219.67 and 909.90

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Solution

The fourth proportional to 1,608.66, 2,219.67 and 909.90 is: 1,255.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,608.66 : 2,219.67 = 909.90 : x
  2. Step 2: Convert to fraction form
    1,608.66/2,219.67 = 909.90/x
  3. Step 3: Cross multiply
    1,608.66x = 2,219.67 × 909.90
  4. Step 4: Simplify right side
    1,608.66x = 2,019,677.73
  5. Step 5: Solve for x
    x = 2,019,677.73/1,608.66
  6. Step 6: Final answer
    x = 1,255.50

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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.