Home / 100,686.06-138,947.70-55,364.33

Finding the Fourth Proportional to 100,686.06, 138,947.70 and 55,364.33

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Solution

The fourth proportional to 100,686.06, 138,947.70 and 55,364.33 is: 76,403.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,686.06 : 138,947.70 = 55,364.33 : x
  2. Step 2: Convert to fraction form
    100,686.06/138,947.70 = 55,364.33/x
  3. Step 3: Cross multiply
    100,686.06x = 138,947.70 × 55,364.33
  4. Step 4: Simplify right side
    100,686.06x = 7,692,745,620.80
  5. Step 5: Solve for x
    x = 7,692,745,620.80/100,686.06
  6. Step 6: Final answer
    x = 76,403.28

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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.