Home / 221,128.07-305,157.63-125,640

Finding the Fourth Proportional to 221,128.07, 305,157.63 and 125,640

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Solution

The fourth proportional to 221,128.07, 305,157.63 and 125,640 is: 173,383.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,128.07 : 305,157.63 = 125,640 : x
  2. Step 2: Convert to fraction form
    221,128.07/305,157.63 = 125,640/x
  3. Step 3: Cross multiply
    221,128.07x = 305,157.63 × 125,640
  4. Step 4: Simplify right side
    221,128.07x = 38,340,004,633.20
  5. Step 5: Solve for x
    x = 38,340,004,633.20/221,128.07
  6. Step 6: Final answer
    x = 173,383.71

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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.