Home / 78,419.74-117,629.61-28,490.53

Finding the Fourth Proportional to 78,419.74, 117,629.61 and 28,490.53

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Solution

The fourth proportional to 78,419.74, 117,629.61 and 28,490.53 is: 42,735.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,419.74 : 117,629.61 = 28,490.53 : x
  2. Step 2: Convert to fraction form
    78,419.74/117,629.61 = 28,490.53/x
  3. Step 3: Cross multiply
    78,419.74x = 117,629.61 × 28,490.53
  4. Step 4: Simplify right side
    78,419.74x = 3,351,329,932.59
  5. Step 5: Solve for x
    x = 3,351,329,932.59/78,419.74
  6. Step 6: Final answer
    x = 42,735.80

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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.