Home / 78,072.12-117,112.98-31,318.92

Finding the Fourth Proportional to 78,072.12, 117,112.98 and 31,318.92

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Solution

The fourth proportional to 78,072.12, 117,112.98 and 31,318.92 is: 46,980.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,072.12 : 117,112.98 = 31,318.92 : x
  2. Step 2: Convert to fraction form
    78,072.12/117,112.98 = 31,318.92/x
  3. Step 3: Cross multiply
    78,072.12x = 117,112.98 × 31,318.92
  4. Step 4: Simplify right side
    78,072.12x = 3,667,852,051.58
  5. Step 5: Solve for x
    x = 3,667,852,051.58/78,072.12
  6. Step 6: Final answer
    x = 46,980.31

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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.