Home / 128,238.78-192,397.05-90,871.26

Finding the Fourth Proportional to 128,238.78, 192,397.05 and 90,871.26

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Solution

The fourth proportional to 128,238.78, 192,397.05 and 90,871.26 is: 136,334.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,238.78 : 192,397.05 = 90,871.26 : x
  2. Step 2: Convert to fraction form
    128,238.78/192,397.05 = 90,871.26/x
  3. Step 3: Cross multiply
    128,238.78x = 192,397.05 × 90,871.26
  4. Step 4: Simplify right side
    128,238.78x = 17,483,362,353.78
  5. Step 5: Solve for x
    x = 17,483,362,353.78/128,238.78
  6. Step 6: Final answer
    x = 136,334.44

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1.5x scale

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.