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Finding the Fourth Proportional to 86,420.25, 129,630.38 and 20,756.25

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Solution

The fourth proportional to 86,420.25, 129,630.38 and 20,756.25 is: 31,134.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,420.25 : 129,630.38 = 20,756.25 : x
  2. Step 2: Convert to fraction form
    86,420.25/129,630.38 = 20,756.25/x
  3. Step 3: Cross multiply
    86,420.25x = 129,630.38 × 20,756.25
  4. Step 4: Simplify right side
    86,420.25x = 2,690,640,471.09
  5. Step 5: Solve for x
    x = 2,690,640,471.09/86,420.25
  6. Step 6: Final answer
    x = 31,134.38

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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.