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Finding the Fourth Proportional to 18,006.68, 26,999.89 and 12,390.95

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Solution

The fourth proportional to 18,006.68, 26,999.89 and 12,390.95 is: 18,579.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,006.68 : 26,999.89 = 12,390.95 : x
  2. Step 2: Convert to fraction form
    18,006.68/26,999.89 = 12,390.95/x
  3. Step 3: Cross multiply
    18,006.68x = 26,999.89 × 12,390.95
  4. Step 4: Simplify right side
    18,006.68x = 334,554,287.00
  5. Step 5: Solve for x
    x = 334,554,287.00/18,006.68
  6. Step 6: Final answer
    x = 18,579.45

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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.