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Finding the Fourth Proportional to 1,608.21, 2,219.63 and 909.59

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Solution

The fourth proportional to 1,608.21, 2,219.63 and 909.59 is: 1,255.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,608.21 : 2,219.63 = 909.59 : x
  2. Step 2: Convert to fraction form
    1,608.21/2,219.63 = 909.59/x
  3. Step 3: Cross multiply
    1,608.21x = 2,219.63 × 909.59
  4. Step 4: Simplify right side
    1,608.21x = 2,018,937.61
  5. Step 5: Solve for x
    x = 2,018,937.61/1,608.21
  6. Step 6: Final answer
    x = 1,255.39

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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.