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Finding the Fourth Proportional to 28,358.56, 42,539.58 and 8,638.48

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Solution

The fourth proportional to 28,358.56, 42,539.58 and 8,638.48 is: 12,958.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,358.56 : 42,539.58 = 8,638.48 : x
  2. Step 2: Convert to fraction form
    28,358.56/42,539.58 = 8,638.48/x
  3. Step 3: Cross multiply
    28,358.56x = 42,539.58 × 8,638.48
  4. Step 4: Simplify right side
    28,358.56x = 367,477,311.04
  5. Step 5: Solve for x
    x = 367,477,311.04/28,358.56
  6. Step 6: Final answer
    x = 12,958.25

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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.