Home / 78,085.06-117,132.72-31,331.86

Finding the Fourth Proportional to 78,085.06, 117,132.72 and 31,331.86

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Solution

The fourth proportional to 78,085.06, 117,132.72 and 31,331.86 is: 46,999.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,085.06 : 117,132.72 = 31,331.86 : x
  2. Step 2: Convert to fraction form
    78,085.06/117,132.72 = 31,331.86/x
  3. Step 3: Cross multiply
    78,085.06x = 117,132.72 × 31,331.86
  4. Step 4: Simplify right side
    78,085.06x = 3,669,985,984.46
  5. Step 5: Solve for x
    x = 3,669,985,984.46/78,085.06
  6. Step 6: Final answer
    x = 46,999.85

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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.