Home / 30,717.36-42,390-18,144.72

Finding the Fourth Proportional to 30,717.36, 42,390 and 18,144.72

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Solution

The fourth proportional to 30,717.36, 42,390 and 18,144.72 is: 25,039.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,717.36 : 42,390 = 18,144.72 : x
  2. Step 2: Convert to fraction form
    30,717.36/42,390 = 18,144.72/x
  3. Step 3: Cross multiply
    30,717.36x = 42,390 × 18,144.72
  4. Step 4: Simplify right side
    30,717.36x = 769,154,680.80
  5. Step 5: Solve for x
    x = 769,154,680.80/30,717.36
  6. Step 6: Final answer
    x = 25,039.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.