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Finding the Fourth Proportional to 209,958.80, 314,938.20 and 85,389.20

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Solution

The fourth proportional to 209,958.80, 314,938.20 and 85,389.20 is: 128,083.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,958.80 : 314,938.20 = 85,389.20 : x
  2. Step 2: Convert to fraction form
    209,958.80/314,938.20 = 85,389.20/x
  3. Step 3: Cross multiply
    209,958.80x = 314,938.20 × 85,389.20
  4. Step 4: Simplify right side
    209,958.80x = 26,892,320,947.44
  5. Step 5: Solve for x
    x = 26,892,320,947.44/209,958.80
  6. Step 6: Final answer
    x = 128,083.80

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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.