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Finding the Fourth Proportional to 86,432.25, 129,648.38 and 20,768.25

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Solution

The fourth proportional to 86,432.25, 129,648.38 and 20,768.25 is: 31,152.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,432.25 : 129,648.38 = 20,768.25 : x
  2. Step 2: Convert to fraction form
    86,432.25/129,648.38 = 20,768.25/x
  3. Step 3: Cross multiply
    86,432.25x = 129,648.38 × 20,768.25
  4. Step 4: Simplify right side
    86,432.25x = 2,692,569,864.09
  5. Step 5: Solve for x
    x = 2,692,569,864.09/86,432.25
  6. Step 6: Final answer
    x = 31,152.38

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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.