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Finding the Fourth Proportional to 18,683.78, 25,960.55 and 18,488.77

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Solution

The fourth proportional to 18,683.78, 25,960.55 and 18,488.77 is: 25,689.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,683.78 : 25,960.55 = 18,488.77 : x
  2. Step 2: Convert to fraction form
    18,683.78/25,960.55 = 18,488.77/x
  3. Step 3: Cross multiply
    18,683.78x = 25,960.55 × 18,488.77
  4. Step 4: Simplify right side
    18,683.78x = 479,978,480.68
  5. Step 5: Solve for x
    x = 479,978,480.68/18,683.78
  6. Step 6: Final answer
    x = 25,689.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.