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Finding the Fourth Proportional to 1,608.40, 2,219.34 and 909.64

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Solution

The fourth proportional to 1,608.40, 2,219.34 and 909.64 is: 1,255.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,608.40 : 2,219.34 = 909.64 : x
  2. Step 2: Convert to fraction form
    1,608.40/2,219.34 = 909.64/x
  3. Step 3: Cross multiply
    1,608.40x = 2,219.34 × 909.64
  4. Step 4: Simplify right side
    1,608.40x = 2,018,800.44
  5. Step 5: Solve for x
    x = 2,018,800.44/1,608.40
  6. Step 6: Final answer
    x = 1,255.16

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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.