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Finding the Fourth Proportional to 18,639, 25,721.82 and 10,255.50

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Solution

The fourth proportional to 18,639, 25,721.82 and 10,255.50 is: 14,152.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,639 : 25,721.82 = 10,255.50 : x
  2. Step 2: Convert to fraction form
    18,639/25,721.82 = 10,255.50/x
  3. Step 3: Cross multiply
    18,639x = 25,721.82 × 10,255.50
  4. Step 4: Simplify right side
    18,639x = 263,790,125.01
  5. Step 5: Solve for x
    x = 263,790,125.01/18,639
  6. Step 6: Final answer
    x = 14,152.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.