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Finding the Fourth Proportional to 78,090.72, 117,135.03 and 18,926.90

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Solution

The fourth proportional to 78,090.72, 117,135.03 and 18,926.90 is: 28,390.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,090.72 : 117,135.03 = 18,926.90 : x
  2. Step 2: Convert to fraction form
    78,090.72/117,135.03 = 18,926.90/x
  3. Step 3: Cross multiply
    78,090.72x = 117,135.03 × 18,926.90
  4. Step 4: Simplify right side
    78,090.72x = 2,217,002,413.63
  5. Step 5: Solve for x
    x = 2,217,002,413.63/78,090.72
  6. Step 6: Final answer
    x = 28,390.09

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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.