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Finding the Fourth Proportional to 20,387.01, 30,580.50 and 13,459.89

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Solution

The fourth proportional to 20,387.01, 30,580.50 and 13,459.89 is: 20,189.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.01 : 30,580.50 = 13,459.89 : x
  2. Step 2: Convert to fraction form
    20,387.01/30,580.50 = 13,459.89/x
  3. Step 3: Cross multiply
    20,387.01x = 30,580.50 × 13,459.89
  4. Step 4: Simplify right side
    20,387.01x = 411,610,166.15
  5. Step 5: Solve for x
    x = 411,610,166.15/20,387.01
  6. Step 6: Final answer
    x = 20,189.83

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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.