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Finding the Fourth Proportional to 18,939, 26,135.92 and 10,985.94

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Solution

The fourth proportional to 18,939, 26,135.92 and 10,985.94 is: 15,160.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939 : 26,135.92 = 10,985.94 : x
  2. Step 2: Convert to fraction form
    18,939/26,135.92 = 10,985.94/x
  3. Step 3: Cross multiply
    18,939x = 26,135.92 × 10,985.94
  4. Step 4: Simplify right side
    18,939x = 287,127,648.96
  5. Step 5: Solve for x
    x = 287,127,648.96/18,939
  6. Step 6: Final answer
    x = 15,160.66

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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.