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Finding the Fourth Proportional to 209,942.80, 314,914.20 and 85,373.20

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Solution

The fourth proportional to 209,942.80, 314,914.20 and 85,373.20 is: 128,059.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,942.80 : 314,914.20 = 85,373.20 : x
  2. Step 2: Convert to fraction form
    209,942.80/314,914.20 = 85,373.20/x
  3. Step 3: Cross multiply
    209,942.80x = 314,914.20 × 85,373.20
  4. Step 4: Simplify right side
    209,942.80x = 26,885,232,979.44
  5. Step 5: Solve for x
    x = 26,885,232,979.44/209,942.80
  6. Step 6: Final answer
    x = 128,059.80

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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.