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Finding the Fourth Proportional to 72,861.07, 109,291.00 and 20,270.40

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Solution

The fourth proportional to 72,861.07, 109,291.00 and 20,270.40 is: 30,405.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,861.07 : 109,291.00 = 20,270.40 : x
  2. Step 2: Convert to fraction form
    72,861.07/109,291.00 = 20,270.40/x
  3. Step 3: Cross multiply
    72,861.07x = 109,291.00 × 20,270.40
  4. Step 4: Simplify right side
    72,861.07x = 2,215,372,421.64
  5. Step 5: Solve for x
    x = 2,215,372,421.64/72,861.07
  6. Step 6: Final answer
    x = 30,405.43

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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.