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Finding the Fourth Proportional to 169,919.40, 254,879.10 and 128,447.40

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Solution

The fourth proportional to 169,919.40, 254,879.10 and 128,447.40 is: 192,671.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    169,919.40 : 254,879.10 = 128,447.40 : x
  2. Step 2: Convert to fraction form
    169,919.40/254,879.10 = 128,447.40/x
  3. Step 3: Cross multiply
    169,919.40x = 254,879.10 × 128,447.40
  4. Step 4: Simplify right side
    169,919.40x = 32,738,557,709.34
  5. Step 5: Solve for x
    x = 32,738,557,709.34/169,919.40
  6. Step 6: Final answer
    x = 192,671.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.