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Finding the Fourth Proportional to 18,919.62, 26,109.12 and 10,421.46

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Solution

The fourth proportional to 18,919.62, 26,109.12 and 10,421.46 is: 14,381.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.62 : 26,109.12 = 10,421.46 : x
  2. Step 2: Convert to fraction form
    18,919.62/26,109.12 = 10,421.46/x
  3. Step 3: Cross multiply
    18,919.62x = 26,109.12 × 10,421.46
  4. Step 4: Simplify right side
    18,919.62x = 272,095,149.72
  5. Step 5: Solve for x
    x = 272,095,149.72/18,919.62
  6. Step 6: Final answer
    x = 14,381.64

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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.