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Finding the Fourth Proportional to 111,615.78, 154,029.78 and 61,314.78

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Solution

The fourth proportional to 111,615.78, 154,029.78 and 61,314.78 is: 84,614.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,615.78 : 154,029.78 = 61,314.78 : x
  2. Step 2: Convert to fraction form
    111,615.78/154,029.78 = 61,314.78/x
  3. Step 3: Cross multiply
    111,615.78x = 154,029.78 × 61,314.78
  4. Step 4: Simplify right side
    111,615.78x = 9,444,302,074.15
  5. Step 5: Solve for x
    x = 9,444,302,074.15/111,615.78
  6. Step 6: Final answer
    x = 84,614.40

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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.