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Finding the Fourth Proportional to 210,620.80, 315,470.40 and 127,369.60

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Solution

The fourth proportional to 210,620.80, 315,470.40 and 127,369.60 is: 190,775.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,620.80 : 315,470.40 = 127,369.60 : x
  2. Step 2: Convert to fraction form
    210,620.80/315,470.40 = 127,369.60/x
  3. Step 3: Cross multiply
    210,620.80x = 315,470.40 × 127,369.60
  4. Step 4: Simplify right side
    210,620.80x = 40,181,338,659.84
  5. Step 5: Solve for x
    x = 40,181,338,659.84/210,620.80
  6. Step 6: Final answer
    x = 190,775.74

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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.