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Finding the Fourth Proportional to 78,090.51, 117,134.76 and 18,926.70

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Solution

The fourth proportional to 78,090.51, 117,134.76 and 18,926.70 is: 28,389.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,090.51 : 117,134.76 = 18,926.70 : x
  2. Step 2: Convert to fraction form
    78,090.51/117,134.76 = 18,926.70/x
  3. Step 3: Cross multiply
    78,090.51x = 117,134.76 × 18,926.70
  4. Step 4: Simplify right side
    78,090.51x = 2,216,974,462.09
  5. Step 5: Solve for x
    x = 2,216,974,462.09/78,090.51
  6. Step 6: Final answer
    x = 28,389.81

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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.