Home / 78,288.09-117,431.83-28,356.51

Finding the Fourth Proportional to 78,288.09, 117,431.83 and 28,356.51

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Solution

The fourth proportional to 78,288.09, 117,431.83 and 28,356.51 is: 42,534.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,288.09 : 117,431.83 = 28,356.51 : x
  2. Step 2: Convert to fraction form
    78,288.09/117,431.83 = 28,356.51/x
  3. Step 3: Cross multiply
    78,288.09x = 117,431.83 × 28,356.51
  4. Step 4: Simplify right side
    78,288.09x = 3,329,956,187.19
  5. Step 5: Solve for x
    x = 3,329,956,187.19/78,288.09
  6. Step 6: Final answer
    x = 42,534.64

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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.