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Finding the Fourth Proportional to 323,780.40, 485,152.20 and 212,842.80

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Solution

The fourth proportional to 323,780.40, 485,152.20 and 212,842.80 is: 318,923.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,780.40 : 485,152.20 = 212,842.80 : x
  2. Step 2: Convert to fraction form
    323,780.40/485,152.20 = 212,842.80/x
  3. Step 3: Cross multiply
    323,780.40x = 485,152.20 × 212,842.80
  4. Step 4: Simplify right side
    323,780.40x = 103,261,152,674.16
  5. Step 5: Solve for x
    x = 103,261,152,674.16/323,780.40
  6. Step 6: Final answer
    x = 318,923.42

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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.