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Finding the Fourth Proportional to 208,090.40, 312,135.60 and 89,992.40

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Solution

The fourth proportional to 208,090.40, 312,135.60 and 89,992.40 is: 134,988.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,090.40 : 312,135.60 = 89,992.40 : x
  2. Step 2: Convert to fraction form
    208,090.40/312,135.60 = 89,992.40/x
  3. Step 3: Cross multiply
    208,090.40x = 312,135.60 × 89,992.40
  4. Step 4: Simplify right side
    208,090.40x = 28,089,831,769.44
  5. Step 5: Solve for x
    x = 28,089,831,769.44/208,090.40
  6. Step 6: Final answer
    x = 134,988.60

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1.5x scale

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.