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Finding the Fourth Proportional to 78,391.80, 117,501.30 and 43,356.60

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Solution

The fourth proportional to 78,391.80, 117,501.30 and 43,356.60 is: 64,987.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,391.80 : 117,501.30 = 43,356.60 : x
  2. Step 2: Convert to fraction form
    78,391.80/117,501.30 = 43,356.60/x
  3. Step 3: Cross multiply
    78,391.80x = 117,501.30 × 43,356.60
  4. Step 4: Simplify right side
    78,391.80x = 5,094,456,863.58
  5. Step 5: Solve for x
    x = 5,094,456,863.58/78,391.80
  6. Step 6: Final answer
    x = 64,987.11

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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.