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Finding the Fourth Proportional to 111,428.25, 153,768.51 and 63,023.78

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Solution

The fourth proportional to 111,428.25, 153,768.51 and 63,023.78 is: 86,971.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,428.25 : 153,768.51 = 63,023.78 : x
  2. Step 2: Convert to fraction form
    111,428.25/153,768.51 = 63,023.78/x
  3. Step 3: Cross multiply
    111,428.25x = 153,768.51 × 63,023.78
  4. Step 4: Simplify right side
    111,428.25x = 9,691,071,976.33
  5. Step 5: Solve for x
    x = 9,691,071,976.33/111,428.25
  6. Step 6: Final answer
    x = 86,971.41

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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.