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Finding the Fourth Proportional to 121,279,266.80, 181,918,900.20 and 66,670,751.60

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Solution

The fourth proportional to 121,279,266.80, 181,918,900.20 and 66,670,751.60 is: 100,006,127.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,279,266.80 : 181,918,900.20 = 66,670,751.60 : x
  2. Step 2: Convert to fraction form
    121,279,266.80/181,918,900.20 = 66,670,751.60/x
  3. Step 3: Cross multiply
    121,279,266.80x = 181,918,900.20 × 66,670,751.60
  4. Step 4: Simplify right side
    121,279,266.80x = 12,128,669,806,579,390
  5. Step 5: Solve for x
    x = 12,128,669,806,579,390/121,279,266.80
  6. Step 6: Final answer
    x = 100,006,127.40

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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.