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Finding the Fourth Proportional to 121,278,978.80, 181,918,468.20 and 66,670,463.60

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Solution

The fourth proportional to 121,278,978.80, 181,918,468.20 and 66,670,463.60 is: 100,005,695.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,278,978.80 : 181,918,468.20 = 66,670,463.60 : x
  2. Step 2: Convert to fraction form
    121,278,978.80/181,918,468.20 = 66,670,463.60/x
  3. Step 3: Cross multiply
    121,278,978.80x = 181,918,468.20 × 66,670,463.60
  4. Step 4: Simplify right side
    121,278,978.80x = 12,128,588,612,295,856
  5. Step 5: Solve for x
    x = 12,128,588,612,295,856/121,278,978.80
  6. Step 6: Final answer
    x = 100,005,695.40

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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.