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Finding the Fourth Proportional to 18,420.39, 25,429.80 and 12,402.31

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Solution

The fourth proportional to 18,420.39, 25,429.80 and 12,402.31 is: 17,121.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.39 : 25,429.80 = 12,402.31 : x
  2. Step 2: Convert to fraction form
    18,420.39/25,429.80 = 12,402.31/x
  3. Step 3: Cross multiply
    18,420.39x = 25,429.80 × 12,402.31
  4. Step 4: Simplify right side
    18,420.39x = 315,388,262.84
  5. Step 5: Solve for x
    x = 315,388,262.84/18,420.39
  6. Step 6: Final answer
    x = 17,121.69

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1.5x scale

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.