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Finding the Fourth Proportional to 12,943.70, 19,415.54 and 4,179.90

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Solution

The fourth proportional to 12,943.70, 19,415.54 and 4,179.90 is: 6,269.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,943.70 : 19,415.54 = 4,179.90 : x
  2. Step 2: Convert to fraction form
    12,943.70/19,415.54 = 4,179.90/x
  3. Step 3: Cross multiply
    12,943.70x = 19,415.54 × 4,179.90
  4. Step 4: Simplify right side
    12,943.70x = 81,154,994.75
  5. Step 5: Solve for x
    x = 81,154,994.75/12,943.70
  6. Step 6: Final answer
    x = 6,269.85

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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.