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Finding the Fourth Proportional to 111,978.95, 154,530.93 and 61,677.95

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Solution

The fourth proportional to 111,978.95, 154,530.93 and 61,677.95 is: 85,115.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,978.95 : 154,530.93 = 61,677.95 : x
  2. Step 2: Convert to fraction form
    111,978.95/154,530.93 = 61,677.95/x
  3. Step 3: Cross multiply
    111,978.95x = 154,530.93 × 61,677.95
  4. Step 4: Simplify right side
    111,978.95x = 9,531,150,201.34
  5. Step 5: Solve for x
    x = 9,531,150,201.34/111,978.95
  6. Step 6: Final answer
    x = 85,115.56

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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.