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Finding the Fourth Proportional to 78,007.20, 117,010.80 and 76,840.80

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Solution

The fourth proportional to 78,007.20, 117,010.80 and 76,840.80 is: 115,261.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,007.20 : 117,010.80 = 76,840.80 : x
  2. Step 2: Convert to fraction form
    78,007.20/117,010.80 = 76,840.80/x
  3. Step 3: Cross multiply
    78,007.20x = 117,010.80 × 76,840.80
  4. Step 4: Simplify right side
    78,007.20x = 8,991,203,480.64
  5. Step 5: Solve for x
    x = 8,991,203,480.64/78,007.20
  6. Step 6: Final answer
    x = 115,261.20

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1.5x scale

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.