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Finding the Fourth Proportional to 15,878.95, 21,907.90 and 9,163.69

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Solution

The fourth proportional to 15,878.95, 21,907.90 and 9,163.69 is: 12,642.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,878.95 : 21,907.90 = 9,163.69 : x
  2. Step 2: Convert to fraction form
    15,878.95/21,907.90 = 9,163.69/x
  3. Step 3: Cross multiply
    15,878.95x = 21,907.90 × 9,163.69
  4. Step 4: Simplify right side
    15,878.95x = 200,757,204.15
  5. Step 5: Solve for x
    x = 200,757,204.15/15,878.95
  6. Step 6: Final answer
    x = 12,642.98

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Double scale
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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.