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Finding the Fourth Proportional to 30,479.84, 45,723.36 and 12,939.92

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Solution

The fourth proportional to 30,479.84, 45,723.36 and 12,939.92 is: 19,411.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,479.84 : 45,723.36 = 12,939.92 : x
  2. Step 2: Convert to fraction form
    30,479.84/45,723.36 = 12,939.92/x
  3. Step 3: Cross multiply
    30,479.84x = 45,723.36 × 12,939.92
  4. Step 4: Simplify right side
    30,479.84x = 591,656,620.53
  5. Step 5: Solve for x
    x = 591,656,620.53/30,479.84
  6. Step 6: Final answer
    x = 19,411.41

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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.