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Finding the Fourth Proportional to 128,396.44, 177,256.74 and 77,418.28

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Solution

The fourth proportional to 128,396.44, 177,256.74 and 77,418.28 is: 106,879.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,396.44 : 177,256.74 = 77,418.28 : x
  2. Step 2: Convert to fraction form
    128,396.44/177,256.74 = 77,418.28/x
  3. Step 3: Cross multiply
    128,396.44x = 177,256.74 × 77,418.28
  4. Step 4: Simplify right side
    128,396.44x = 13,722,911,929.21
  5. Step 5: Solve for x
    x = 13,722,911,929.21/128,396.44
  6. Step 6: Final answer
    x = 106,879.22

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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.