Home / 20,328.90-30,435.84-12,915

Finding the Fourth Proportional to 20,328.90, 30,435.84 and 12,915

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Solution

The fourth proportional to 20,328.90, 30,435.84 and 12,915 is: 19,335.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,328.90 : 30,435.84 = 12,915 : x
  2. Step 2: Convert to fraction form
    20,328.90/30,435.84 = 12,915/x
  3. Step 3: Cross multiply
    20,328.90x = 30,435.84 × 12,915
  4. Step 4: Simplify right side
    20,328.90x = 393,078,873.60
  5. Step 5: Solve for x
    x = 393,078,873.60/20,328.90
  6. Step 6: Final answer
    x = 19,335.96

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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.