Home / 100,958.10-139,320.30-55,640.28

Finding the Fourth Proportional to 100,958.10, 139,320.30 and 55,640.28

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Solution

The fourth proportional to 100,958.10, 139,320.30 and 55,640.28 is: 76,782.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,958.10 : 139,320.30 = 55,640.28 : x
  2. Step 2: Convert to fraction form
    100,958.10/139,320.30 = 55,640.28/x
  3. Step 3: Cross multiply
    100,958.10x = 139,320.30 × 55,640.28
  4. Step 4: Simplify right side
    100,958.10x = 7,751,820,501.68
  5. Step 5: Solve for x
    x = 7,751,820,501.68/100,958.10
  6. Step 6: Final answer
    x = 76,782.55

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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.