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Finding the Fourth Proportional to 111,316.78, 166,364.03 and 81,394.01

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Solution

The fourth proportional to 111,316.78, 166,364.03 and 81,394.01 is: 121,644.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,316.78 : 166,364.03 = 81,394.01 : x
  2. Step 2: Convert to fraction form
    111,316.78/166,364.03 = 81,394.01/x
  3. Step 3: Cross multiply
    111,316.78x = 166,364.03 × 81,394.01
  4. Step 4: Simplify right side
    111,316.78x = 13,541,035,994.95
  5. Step 5: Solve for x
    x = 13,541,035,994.95/111,316.78
  6. Step 6: Final answer
    x = 121,644.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.