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Finding the Fourth Proportional to 111,981.66, 154,534.68 and 61,680.66

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Solution

The fourth proportional to 111,981.66, 154,534.68 and 61,680.66 is: 85,119.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,981.66 : 154,534.68 = 61,680.66 : x
  2. Step 2: Convert to fraction form
    111,981.66/154,534.68 = 61,680.66/x
  3. Step 3: Cross multiply
    111,981.66x = 154,534.68 × 61,680.66
  4. Step 4: Simplify right side
    111,981.66x = 9,531,801,055.29
  5. Step 5: Solve for x
    x = 9,531,801,055.29/111,981.66
  6. Step 6: Final answer
    x = 85,119.30

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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.