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Finding the Fourth Proportional to 111,988.60, 154,544.28 and 61,687.60

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Solution

The fourth proportional to 111,988.60, 154,544.28 and 61,687.60 is: 85,128.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,988.60 : 154,544.28 = 61,687.60 : x
  2. Step 2: Convert to fraction form
    111,988.60/154,544.28 = 61,687.60/x
  3. Step 3: Cross multiply
    111,988.60x = 154,544.28 × 61,687.60
  4. Step 4: Simplify right side
    111,988.60x = 9,533,465,726.93
  5. Step 5: Solve for x
    x = 9,533,465,726.93/111,988.60
  6. Step 6: Final answer
    x = 85,128.89

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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.