Home / 78,135.75-117,209.43-31,388.76

Finding the Fourth Proportional to 78,135.75, 117,209.43 and 31,388.76

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Solution

The fourth proportional to 78,135.75, 117,209.43 and 31,388.76 is: 47,085.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,135.75 : 117,209.43 = 31,388.76 : x
  2. Step 2: Convert to fraction form
    78,135.75/117,209.43 = 31,388.76/x
  3. Step 3: Cross multiply
    78,135.75x = 117,209.43 × 31,388.76
  4. Step 4: Simplify right side
    78,135.75x = 3,679,058,668.01
  5. Step 5: Solve for x
    x = 3,679,058,668.01/78,135.75
  6. Step 6: Final answer
    x = 47,085.47

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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.