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Finding the Fourth Proportional to 10,605.20, 15,907.80 and 8,636.90

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Solution

The fourth proportional to 10,605.20, 15,907.80 and 8,636.90 is: 12,955.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,605.20 : 15,907.80 = 8,636.90 : x
  2. Step 2: Convert to fraction form
    10,605.20/15,907.80 = 8,636.90/x
  3. Step 3: Cross multiply
    10,605.20x = 15,907.80 × 8,636.90
  4. Step 4: Simplify right side
    10,605.20x = 137,394,077.82
  5. Step 5: Solve for x
    x = 137,394,077.82/10,605.20
  6. Step 6: Final answer
    x = 12,955.35

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Similar ratio
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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.