Home / 78,420.78-117,677.16-31,040.28

Finding the Fourth Proportional to 78,420.78, 117,677.16 and 31,040.28

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Solution

The fourth proportional to 78,420.78, 117,677.16 and 31,040.28 is: 46,578.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,420.78 : 117,677.16 = 31,040.28 : x
  2. Step 2: Convert to fraction form
    78,420.78/117,677.16 = 31,040.28/x
  3. Step 3: Cross multiply
    78,420.78x = 117,677.16 × 31,040.28
  4. Step 4: Simplify right side
    78,420.78x = 3,652,731,996.00
  5. Step 5: Solve for x
    x = 3,652,731,996.00/78,420.78
  6. Step 6: Final answer
    x = 46,578.62

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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.