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Finding the Fourth Proportional to 139,953,857.65, 193,174,738.14 and 81,235,440.01

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Solution

The fourth proportional to 139,953,857.65, 193,174,738.14 and 81,235,440.01 is: 112,127,204.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,953,857.65 : 193,174,738.14 = 81,235,440.01 : x
  2. Step 2: Convert to fraction form
    139,953,857.65/193,174,738.14 = 81,235,440.01/x
  3. Step 3: Cross multiply
    139,953,857.65x = 193,174,738.14 × 81,235,440.01
  4. Step 4: Simplify right side
    139,953,857.65x = 15,692,634,851,619,428
  5. Step 5: Solve for x
    x = 15,692,634,851,619,428/139,953,857.65
  6. Step 6: Final answer
    x = 112,127,204.75

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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.