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Finding the Fourth Proportional to 139,989.32, 193,186.08 and 76,328.20

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Solution

The fourth proportional to 139,989.32, 193,186.08 and 76,328.20 is: 105,333.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,989.32 : 193,186.08 = 76,328.20 : x
  2. Step 2: Convert to fraction form
    139,989.32/193,186.08 = 76,328.20/x
  3. Step 3: Cross multiply
    139,989.32x = 193,186.08 × 76,328.20
  4. Step 4: Simplify right side
    139,989.32x = 14,745,545,751.46
  5. Step 5: Solve for x
    x = 14,745,545,751.46/139,989.32
  6. Step 6: Final answer
    x = 105,333.36

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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.