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Finding the Fourth Proportional to 111,988.55, 154,544.21 and 61,687.55

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Solution

The fourth proportional to 111,988.55, 154,544.21 and 61,687.55 is: 85,128.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,988.55 : 154,544.21 = 61,687.55 : x
  2. Step 2: Convert to fraction form
    111,988.55/154,544.21 = 61,687.55/x
  3. Step 3: Cross multiply
    111,988.55x = 154,544.21 × 61,687.55
  4. Step 4: Simplify right side
    111,988.55x = 9,533,453,990.84
  5. Step 5: Solve for x
    x = 9,533,453,990.84/111,988.55
  6. Step 6: Final answer
    x = 85,128.83

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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.