Home / 138,201.94-190,728.36-77,778.40

Finding the Fourth Proportional to 138,201.94, 190,728.36 and 77,778.40

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Solution

The fourth proportional to 138,201.94, 190,728.36 and 77,778.40 is: 107,339.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,201.94 : 190,728.36 = 77,778.40 : x
  2. Step 2: Convert to fraction form
    138,201.94/190,728.36 = 77,778.40/x
  3. Step 3: Cross multiply
    138,201.94x = 190,728.36 × 77,778.40
  4. Step 4: Simplify right side
    138,201.94x = 14,834,546,675.42
  5. Step 5: Solve for x
    x = 14,834,546,675.42/138,201.94
  6. Step 6: Final answer
    x = 107,339.64

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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.