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Finding the Fourth Proportional to 139,953,844.64, 193,174,720.19 and 81,235,427.01

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Solution

The fourth proportional to 139,953,844.64, 193,174,720.19 and 81,235,427.01 is: 112,127,186.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,953,844.64 : 193,174,720.19 = 81,235,427.01 : x
  2. Step 2: Convert to fraction form
    139,953,844.64/193,174,720.19 = 81,235,427.01/x
  3. Step 3: Cross multiply
    139,953,844.64x = 193,174,720.19 × 81,235,427.01
  4. Step 4: Simplify right side
    139,953,844.64x = 15,692,630,881,345,968
  5. Step 5: Solve for x
    x = 15,692,630,881,345,968/139,953,844.64
  6. Step 6: Final answer
    x = 112,127,186.80

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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.