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Finding the Fourth Proportional to 86,501, 129,751.50 and 20,837

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Solution

The fourth proportional to 86,501, 129,751.50 and 20,837 is: 31,255.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,501 : 129,751.50 = 20,837 : x
  2. Step 2: Convert to fraction form
    86,501/129,751.50 = 20,837/x
  3. Step 3: Cross multiply
    86,501x = 129,751.50 × 20,837
  4. Step 4: Simplify right side
    86,501x = 2,703,632,005.50
  5. Step 5: Solve for x
    x = 2,703,632,005.50/86,501
  6. Step 6: Final answer
    x = 31,255.50

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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.