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Finding the Fourth Proportional to 30,407.92, 41,959.87 and 20,855.96

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Solution

The fourth proportional to 30,407.92, 41,959.87 and 20,855.96 is: 28,779.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,407.92 : 41,959.87 = 20,855.96 : x
  2. Step 2: Convert to fraction form
    30,407.92/41,959.87 = 20,855.96/x
  3. Step 3: Cross multiply
    30,407.92x = 41,959.87 × 20,855.96
  4. Step 4: Simplify right side
    30,407.92x = 875,113,265.74
  5. Step 5: Solve for x
    x = 875,113,265.74/30,407.92
  6. Step 6: Final answer
    x = 28,779.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.