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Finding the Fourth Proportional to 12,978.18, 17,907.21 and 8,260.74

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Solution

The fourth proportional to 12,978.18, 17,907.21 and 8,260.74 is: 11,398.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,978.18 : 17,907.21 = 8,260.74 : x
  2. Step 2: Convert to fraction form
    12,978.18/17,907.21 = 8,260.74/x
  3. Step 3: Cross multiply
    12,978.18x = 17,907.21 × 8,260.74
  4. Step 4: Simplify right side
    12,978.18x = 147,926,805.94
  5. Step 5: Solve for x
    x = 147,926,805.94/12,978.18
  6. Step 6: Final answer
    x = 11,398.12

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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.