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Finding the Fourth Proportional to 116,992, 161,477.76 and 66,720

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Solution

The fourth proportional to 116,992, 161,477.76 and 66,720 is: 92,090.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    116,992 : 161,477.76 = 66,720 : x
  2. Step 2: Convert to fraction form
    116,992/161,477.76 = 66,720/x
  3. Step 3: Cross multiply
    116,992x = 161,477.76 × 66,720
  4. Step 4: Simplify right side
    116,992x = 10,773,796,147.20
  5. Step 5: Solve for x
    x = 10,773,796,147.20/116,992
  6. Step 6: Final answer
    x = 92,090.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.