Home / 78,143.04-117,234-30,761.28

Finding the Fourth Proportional to 78,143.04, 117,234 and 30,761.28

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Solution

The fourth proportional to 78,143.04, 117,234 and 30,761.28 is: 46,149.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,143.04 : 117,234 = 30,761.28 : x
  2. Step 2: Convert to fraction form
    78,143.04/117,234 = 30,761.28/x
  3. Step 3: Cross multiply
    78,143.04x = 117,234 × 30,761.28
  4. Step 4: Simplify right side
    78,143.04x = 3,606,267,899.52
  5. Step 5: Solve for x
    x = 3,606,267,899.52/78,143.04
  6. Step 6: Final answer
    x = 46,149.57

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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.