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Finding the Fourth Proportional to 78,091.93, 117,137.89 and 18,927.60

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Solution

The fourth proportional to 78,091.93, 117,137.89 and 18,927.60 is: 28,391.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,091.93 : 117,137.89 = 18,927.60 : x
  2. Step 2: Convert to fraction form
    78,091.93/117,137.89 = 18,927.60/x
  3. Step 3: Cross multiply
    78,091.93x = 117,137.89 × 18,927.60
  4. Step 4: Simplify right side
    78,091.93x = 2,217,139,126.76
  5. Step 5: Solve for x
    x = 2,217,139,126.76/78,091.93
  6. Step 6: Final answer
    x = 28,391.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.