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Finding the Fourth Proportional to 78,090.93, 117,136.39 and 18,926.60

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Solution

The fourth proportional to 78,090.93, 117,136.39 and 18,926.60 is: 28,389.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,090.93 : 117,136.39 = 18,926.60 : x
  2. Step 2: Convert to fraction form
    78,090.93/117,136.39 = 18,926.60/x
  3. Step 3: Cross multiply
    78,090.93x = 117,136.39 × 18,926.60
  4. Step 4: Simplify right side
    78,090.93x = 2,216,993,330.91
  5. Step 5: Solve for x
    x = 2,216,993,330.91/78,090.93
  6. Step 6: Final answer
    x = 28,389.90

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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.