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Finding the Fourth Proportional to 243,387.20, 365,135.20 and 85,620.80

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Solution

The fourth proportional to 243,387.20, 365,135.20 and 85,620.80 is: 128,450.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    243,387.20 : 365,135.20 = 85,620.80 : x
  2. Step 2: Convert to fraction form
    243,387.20/365,135.20 = 85,620.80/x
  3. Step 3: Cross multiply
    243,387.20x = 365,135.20 × 85,620.80
  4. Step 4: Simplify right side
    243,387.20x = 31,263,167,932.16
  5. Step 5: Solve for x
    x = 31,263,167,932.16/243,387.20
  6. Step 6: Final answer
    x = 128,450.34

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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.