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Finding the Fourth Proportional to 248,068,821.66, 342,334,978.47 and 138,086,516.22

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Solution

The fourth proportional to 248,068,821.66, 342,334,978.47 and 138,086,516.22 is: 190,559,394.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    248,068,821.66 : 342,334,978.47 = 138,086,516.22 : x
  2. Step 2: Convert to fraction form
    248,068,821.66/342,334,978.47 = 138,086,516.22/x
  3. Step 3: Cross multiply
    248,068,821.66x = 342,334,978.47 × 138,086,516.22
  4. Step 4: Simplify right side
    248,068,821.66x = 47,271,844,557,171,008
  5. Step 5: Solve for x
    x = 47,271,844,557,171,008/248,068,821.66
  6. Step 6: Final answer
    x = 190,559,394.93

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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.