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Finding the Fourth Proportional to 111,246.40, 166,869.60 and 81,357.40

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Solution

The fourth proportional to 111,246.40, 166,869.60 and 81,357.40 is: 122,036.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,246.40 : 166,869.60 = 81,357.40 : x
  2. Step 2: Convert to fraction form
    111,246.40/166,869.60 = 81,357.40/x
  3. Step 3: Cross multiply
    111,246.40x = 166,869.60 × 81,357.40
  4. Step 4: Simplify right side
    111,246.40x = 13,576,076,795.04
  5. Step 5: Solve for x
    x = 13,576,076,795.04/111,246.40
  6. Step 6: Final answer
    x = 122,036.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.