Home / 78,090.53-117,134.75-18,926.71

Finding the Fourth Proportional to 78,090.53, 117,134.75 and 18,926.71

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Solution

The fourth proportional to 78,090.53, 117,134.75 and 18,926.71 is: 28,389.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,090.53 : 117,134.75 = 18,926.71 : x
  2. Step 2: Convert to fraction form
    78,090.53/117,134.75 = 18,926.71/x
  3. Step 3: Cross multiply
    78,090.53x = 117,134.75 × 18,926.71
  4. Step 4: Simplify right side
    78,090.53x = 2,216,975,198.65
  5. Step 5: Solve for x
    x = 2,216,975,198.65/78,090.53
  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.