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Finding the Fourth Proportional to 18,919.30, 26,109.18 and 10,421.95

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Solution

The fourth proportional to 18,919.30, 26,109.18 and 10,421.95 is: 14,382.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.30 : 26,109.18 = 10,421.95 : x
  2. Step 2: Convert to fraction form
    18,919.30/26,109.18 = 10,421.95/x
  3. Step 3: Cross multiply
    18,919.30x = 26,109.18 × 10,421.95
  4. Step 4: Simplify right side
    18,919.30x = 272,108,568.50
  5. Step 5: Solve for x
    x = 272,108,568.50/18,919.30
  6. Step 6: Final answer
    x = 14,382.59

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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.