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Finding the Fourth Proportional to 111,321, 153,623.52 and 66,609

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Solution

The fourth proportional to 111,321, 153,623.52 and 66,609 is: 91,920.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,321 : 153,623.52 = 66,609 : x
  2. Step 2: Convert to fraction form
    111,321/153,623.52 = 66,609/x
  3. Step 3: Cross multiply
    111,321x = 153,623.52 × 66,609
  4. Step 4: Simplify right side
    111,321x = 10,232,709,043.68
  5. Step 5: Solve for x
    x = 10,232,709,043.68/111,321
  6. Step 6: Final answer
    x = 91,920.74

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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.