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Finding the Fourth Proportional to 86,409.50, 129,614.26 and 20,745.50

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Solution

The fourth proportional to 86,409.50, 129,614.26 and 20,745.50 is: 31,118.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,409.50 : 129,614.26 = 20,745.50 : x
  2. Step 2: Convert to fraction form
    86,409.50/129,614.26 = 20,745.50/x
  3. Step 3: Cross multiply
    86,409.50x = 129,614.26 × 20,745.50
  4. Step 4: Simplify right side
    86,409.50x = 2,688,912,630.83
  5. Step 5: Solve for x
    x = 2,688,912,630.83/86,409.50
  6. Step 6: Final answer
    x = 31,118.25

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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.