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Finding the Fourth Proportional to 111,989.94, 154,546.08 and 61,688.94

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Solution

The fourth proportional to 111,989.94, 154,546.08 and 61,688.94 is: 85,130.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,989.94 : 154,546.08 = 61,688.94 : x
  2. Step 2: Convert to fraction form
    111,989.94/154,546.08 = 61,688.94/x
  3. Step 3: Cross multiply
    111,989.94x = 154,546.08 × 61,688.94
  4. Step 4: Simplify right side
    111,989.94x = 9,533,783,856.36
  5. Step 5: Solve for x
    x = 9,533,783,856.36/111,989.94
  6. Step 6: Final answer
    x = 85,130.72

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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.