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Finding the Fourth Proportional to 18,089.40, 27,081.30 and 12,905.40

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Solution

The fourth proportional to 18,089.40, 27,081.30 and 12,905.40 is: 19,320.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,089.40 : 27,081.30 = 12,905.40 : x
  2. Step 2: Convert to fraction form
    18,089.40/27,081.30 = 12,905.40/x
  3. Step 3: Cross multiply
    18,089.40x = 27,081.30 × 12,905.40
  4. Step 4: Simplify right side
    18,089.40x = 349,495,009.02
  5. Step 5: Solve for x
    x = 349,495,009.02/18,089.40
  6. Step 6: Final answer
    x = 19,320.43

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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.