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Finding the Fourth Proportional to 18,708.40, 25,804.08 and 12,729.52

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Solution

The fourth proportional to 18,708.40, 25,804.08 and 12,729.52 is: 17,557.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,708.40 : 25,804.08 = 12,729.52 : x
  2. Step 2: Convert to fraction form
    18,708.40/25,804.08 = 12,729.52/x
  3. Step 3: Cross multiply
    18,708.40x = 25,804.08 × 12,729.52
  4. Step 4: Simplify right side
    18,708.40x = 328,473,552.44
  5. Step 5: Solve for x
    x = 328,473,552.44/18,708.40
  6. Step 6: Final answer
    x = 17,557.54

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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.