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Finding the Fourth Proportional to 20,308.68, 30,421.12 and 18,607.68

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Solution

The fourth proportional to 20,308.68, 30,421.12 and 18,607.68 is: 27,873.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,308.68 : 30,421.12 = 18,607.68 : x
  2. Step 2: Convert to fraction form
    20,308.68/30,421.12 = 18,607.68/x
  3. Step 3: Cross multiply
    20,308.68x = 30,421.12 × 18,607.68
  4. Step 4: Simplify right side
    20,308.68x = 566,066,466.20
  5. Step 5: Solve for x
    x = 566,066,466.20/20,308.68
  6. Step 6: Final answer
    x = 27,873.13

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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.