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Finding the Fourth Proportional to 111,330, 153,635.94 and 66,618

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Solution

The fourth proportional to 111,330, 153,635.94 and 66,618 is: 91,933.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,330 : 153,635.94 = 66,618 : x
  2. Step 2: Convert to fraction form
    111,330/153,635.94 = 66,618/x
  3. Step 3: Cross multiply
    111,330x = 153,635.94 × 66,618
  4. Step 4: Simplify right side
    111,330x = 10,234,919,050.92
  5. Step 5: Solve for x
    x = 10,234,919,050.92/111,330
  6. Step 6: Final answer
    x = 91,933.16

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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.