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Finding the Fourth Proportional to 12,891.90, 18,100.50 and 12,891.90

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Solution

The fourth proportional to 12,891.90, 18,100.50 and 12,891.90 is: 18,100.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.90 : 18,100.50 = 12,891.90 : x
  2. Step 2: Convert to fraction form
    12,891.90/18,100.50 = 12,891.90/x
  3. Step 3: Cross multiply
    12,891.90x = 18,100.50 × 12,891.90
  4. Step 4: Simplify right side
    12,891.90x = 233,349,835.95
  5. Step 5: Solve for x
    x = 233,349,835.95/12,891.90
  6. Step 6: Final answer
    x = 18,100.50

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.