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Finding the Fourth Proportional to 86,653.80, 129,980.70 and 81,469.80

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Solution

The fourth proportional to 86,653.80, 129,980.70 and 81,469.80 is: 122,204.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,653.80 : 129,980.70 = 81,469.80 : x
  2. Step 2: Convert to fraction form
    86,653.80/129,980.70 = 81,469.80/x
  3. Step 3: Cross multiply
    86,653.80x = 129,980.70 × 81,469.80
  4. Step 4: Simplify right side
    86,653.80x = 10,589,501,632.86
  5. Step 5: Solve for x
    x = 10,589,501,632.86/86,653.80
  6. Step 6: Final answer
    x = 122,204.70

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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.