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Finding the Fourth Proportional to 18,919.96, 26,109.30 and 10,421.91

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Solution

The fourth proportional to 18,919.96, 26,109.30 and 10,421.91 is: 14,382.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.96 : 26,109.30 = 10,421.91 : x
  2. Step 2: Convert to fraction form
    18,919.96/26,109.30 = 10,421.91/x
  3. Step 3: Cross multiply
    18,919.96x = 26,109.30 × 10,421.91
  4. Step 4: Simplify right side
    18,919.96x = 272,108,813.85
  5. Step 5: Solve for x
    x = 272,108,813.85/18,919.96
  6. Step 6: Final answer
    x = 14,382.10

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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.