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Finding the Fourth Proportional to 12,978.69, 19,468.04 and 3,618.33

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Solution

The fourth proportional to 12,978.69, 19,468.04 and 3,618.33 is: 5,427.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,978.69 : 19,468.04 = 3,618.33 : x
  2. Step 2: Convert to fraction form
    12,978.69/19,468.04 = 3,618.33/x
  3. Step 3: Cross multiply
    12,978.69x = 19,468.04 × 3,618.33
  4. Step 4: Simplify right side
    12,978.69x = 70,441,775.08
  5. Step 5: Solve for x
    x = 70,441,775.08/12,978.69
  6. Step 6: Final answer
    x = 5,427.50

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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.