Home / 138,968.20-208,298.70-76,683.40

Finding the Fourth Proportional to 138,968.20, 208,298.70 and 76,683.40

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Solution

The fourth proportional to 138,968.20, 208,298.70 and 76,683.40 is: 114,940.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,968.20 : 208,298.70 = 76,683.40 : x
  2. Step 2: Convert to fraction form
    138,968.20/208,298.70 = 76,683.40/x
  3. Step 3: Cross multiply
    138,968.20x = 208,298.70 × 76,683.40
  4. Step 4: Simplify right side
    138,968.20x = 15,973,052,531.58
  5. Step 5: Solve for x
    x = 15,973,052,531.58/138,968.20
  6. Step 6: Final answer
    x = 114,940.34

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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.