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Finding the Fourth Proportional to 28,078.92, 42,118.35 and 8,357.43

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Solution

The fourth proportional to 28,078.92, 42,118.35 and 8,357.43 is: 12,536.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,078.92 : 42,118.35 = 8,357.43 : x
  2. Step 2: Convert to fraction form
    28,078.92/42,118.35 = 8,357.43/x
  3. Step 3: Cross multiply
    28,078.92x = 42,118.35 × 8,357.43
  4. Step 4: Simplify right side
    28,078.92x = 352,001,161.84
  5. Step 5: Solve for x
    x = 352,001,161.84/28,078.92
  6. Step 6: Final answer
    x = 12,536.14

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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.