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Finding the Fourth Proportional to 86,653.75, 129,980.63 and 31,249.75

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Solution

The fourth proportional to 86,653.75, 129,980.63 and 31,249.75 is: 46,874.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,653.75 : 129,980.63 = 31,249.75 : x
  2. Step 2: Convert to fraction form
    86,653.75/129,980.63 = 31,249.75/x
  3. Step 3: Cross multiply
    86,653.75x = 129,980.63 × 31,249.75
  4. Step 4: Simplify right side
    86,653.75x = 4,061,862,192.34
  5. Step 5: Solve for x
    x = 4,061,862,192.34/86,653.75
  6. Step 6: Final answer
    x = 46,874.63

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Similar ratio
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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.