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Finding the Fourth Proportional to 12,905.70, 18,029.10 and 12,905.70

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Solution

The fourth proportional to 12,905.70, 18,029.10 and 12,905.70 is: 18,029.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905.70 : 18,029.10 = 12,905.70 : x
  2. Step 2: Convert to fraction form
    12,905.70/18,029.10 = 12,905.70/x
  3. Step 3: Cross multiply
    12,905.70x = 18,029.10 × 12,905.70
  4. Step 4: Simplify right side
    12,905.70x = 232,678,155.87
  5. Step 5: Solve for x
    x = 232,678,155.87/12,905.70
  6. Step 6: Final answer
    x = 18,029.10

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1.5x scale

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.