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Finding the Fourth Proportional to 1,608.32, 2,219.20 and 909.68

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Solution

The fourth proportional to 1,608.32, 2,219.20 and 909.68 is: 1,255.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,608.32 : 2,219.20 = 909.68 : x
  2. Step 2: Convert to fraction form
    1,608.32/2,219.20 = 909.68/x
  3. Step 3: Cross multiply
    1,608.32x = 2,219.20 × 909.68
  4. Step 4: Simplify right side
    1,608.32x = 2,018,761.86
  5. Step 5: Solve for x
    x = 2,018,761.86/1,608.32
  6. Step 6: Final answer
    x = 1,255.20

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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.