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Finding the Fourth Proportional to 18,962.44, 28,459.14 and 13,421.15

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Solution

The fourth proportional to 18,962.44, 28,459.14 and 13,421.15 is: 20,142.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,962.44 : 28,459.14 = 13,421.15 : x
  2. Step 2: Convert to fraction form
    18,962.44/28,459.14 = 13,421.15/x
  3. Step 3: Cross multiply
    18,962.44x = 28,459.14 × 13,421.15
  4. Step 4: Simplify right side
    18,962.44x = 381,954,386.81
  5. Step 5: Solve for x
    x = 381,954,386.81/18,962.44
  6. Step 6: Final answer
    x = 20,142.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.