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Finding the Fourth Proportional to 28,405.02, 42,613.56 and 8,685

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Solution

The fourth proportional to 28,405.02, 42,613.56 and 8,685 is: 13,029.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,405.02 : 42,613.56 = 8,685 : x
  2. Step 2: Convert to fraction form
    28,405.02/42,613.56 = 8,685/x
  3. Step 3: Cross multiply
    28,405.02x = 42,613.56 × 8,685
  4. Step 4: Simplify right side
    28,405.02x = 370,098,768.60
  5. Step 5: Solve for x
    x = 370,098,768.60/28,405.02
  6. Step 6: Final answer
    x = 13,029.34

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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.