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Finding the Fourth Proportional to 20,456.60, 30,749.70 and 18,901.40

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Solution

The fourth proportional to 20,456.60, 30,749.70 and 18,901.40 is: 28,411.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,456.60 : 30,749.70 = 18,901.40 : x
  2. Step 2: Convert to fraction form
    20,456.60/30,749.70 = 18,901.40/x
  3. Step 3: Cross multiply
    20,456.60x = 30,749.70 × 18,901.40
  4. Step 4: Simplify right side
    20,456.60x = 581,212,379.58
  5. Step 5: Solve for x
    x = 581,212,379.58/20,456.60
  6. Step 6: Final answer
    x = 28,411.97

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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.