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Finding the Fourth Proportional to 18,689.43, 25,902.74 and 18,339.51

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Solution

The fourth proportional to 18,689.43, 25,902.74 and 18,339.51 is: 25,417.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.43 : 25,902.74 = 18,339.51 : x
  2. Step 2: Convert to fraction form
    18,689.43/25,902.74 = 18,339.51/x
  3. Step 3: Cross multiply
    18,689.43x = 25,902.74 × 18,339.51
  4. Step 4: Simplify right side
    18,689.43x = 475,043,559.26
  5. Step 5: Solve for x
    x = 475,043,559.26/18,689.43
  6. Step 6: Final answer
    x = 25,417.77

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Double scale
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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.