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Finding the Fourth Proportional to 18,889.61, 26,065.80 and 10,391.58

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Solution

The fourth proportional to 18,889.61, 26,065.80 and 10,391.58 is: 14,339.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,889.61 : 26,065.80 = 10,391.58 : x
  2. Step 2: Convert to fraction form
    18,889.61/26,065.80 = 10,391.58/x
  3. Step 3: Cross multiply
    18,889.61x = 26,065.80 × 10,391.58
  4. Step 4: Simplify right side
    18,889.61x = 270,864,845.96
  5. Step 5: Solve for x
    x = 270,864,845.96/18,889.61
  6. Step 6: Final answer
    x = 14,339.36

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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.