Home / 138,123.54-190,556.51-77,680.32

Finding the Fourth Proportional to 138,123.54, 190,556.51 and 77,680.32

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Solution

The fourth proportional to 138,123.54, 190,556.51 and 77,680.32 is: 107,168.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,123.54 : 190,556.51 = 77,680.32 : x
  2. Step 2: Convert to fraction form
    138,123.54/190,556.51 = 77,680.32/x
  3. Step 3: Cross multiply
    138,123.54x = 190,556.51 × 77,680.32
  4. Step 4: Simplify right side
    138,123.54x = 14,802,490,286.48
  5. Step 5: Solve for x
    x = 14,802,490,286.48/138,123.54
  6. Step 6: Final answer
    x = 107,168.48

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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.