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Finding the Fourth Proportional to 111,980.34, 154,532.70 and 61,679.34

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Solution

The fourth proportional to 111,980.34, 154,532.70 and 61,679.34 is: 85,117.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,980.34 : 154,532.70 = 61,679.34 : x
  2. Step 2: Convert to fraction form
    111,980.34/154,532.70 = 61,679.34/x
  3. Step 3: Cross multiply
    111,980.34x = 154,532.70 × 61,679.34
  4. Step 4: Simplify right side
    111,980.34x = 9,531,474,944.42
  5. Step 5: Solve for x
    x = 9,531,474,944.42/111,980.34
  6. Step 6: Final answer
    x = 85,117.40

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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.