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Finding the Fourth Proportional to 12,891.72, 19,342.14 and 7,955.60

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Solution

The fourth proportional to 12,891.72, 19,342.14 and 7,955.60 is: 11,936.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.72 : 19,342.14 = 7,955.60 : x
  2. Step 2: Convert to fraction form
    12,891.72/19,342.14 = 7,955.60/x
  3. Step 3: Cross multiply
    12,891.72x = 19,342.14 × 7,955.60
  4. Step 4: Simplify right side
    12,891.72x = 153,878,328.98
  5. Step 5: Solve for x
    x = 153,878,328.98/12,891.72
  6. Step 6: Final answer
    x = 11,936.21

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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.