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Finding the Fourth Proportional to 111,981.79, 154,534.84 and 61,680.79

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Solution

The fourth proportional to 111,981.79, 154,534.84 and 61,680.79 is: 85,119.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,981.79 : 154,534.84 = 61,680.79 : x
  2. Step 2: Convert to fraction form
    111,981.79/154,534.84 = 61,680.79/x
  3. Step 3: Cross multiply
    111,981.79x = 154,534.84 × 61,680.79
  4. Step 4: Simplify right side
    111,981.79x = 9,531,831,013.72
  5. Step 5: Solve for x
    x = 9,531,831,013.72/111,981.79
  6. Step 6: Final answer
    x = 85,119.47

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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.