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Finding the Fourth Proportional to 326,801.70, 490,376.70 and 127,128.60

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Solution

The fourth proportional to 326,801.70, 490,376.70 and 127,128.60 is: 190,760.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    326,801.70 : 490,376.70 = 127,128.60 : x
  2. Step 2: Convert to fraction form
    326,801.70/490,376.70 = 127,128.60/x
  3. Step 3: Cross multiply
    326,801.70x = 490,376.70 × 127,128.60
  4. Step 4: Simplify right side
    326,801.70x = 62,340,903,343.62
  5. Step 5: Solve for x
    x = 62,340,903,343.62/326,801.70
  6. Step 6: Final answer
    x = 190,760.65

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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.