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Finding the Fourth Proportional to 12,654.90, 18,982.35 and 3,420.90

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Solution

The fourth proportional to 12,654.90, 18,982.35 and 3,420.90 is: 5,131.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,654.90 : 18,982.35 = 3,420.90 : x
  2. Step 2: Convert to fraction form
    12,654.90/18,982.35 = 3,420.90/x
  3. Step 3: Cross multiply
    12,654.90x = 18,982.35 × 3,420.90
  4. Step 4: Simplify right side
    12,654.90x = 64,936,721.12
  5. Step 5: Solve for x
    x = 64,936,721.12/12,654.90
  6. Step 6: Final answer
    x = 5,131.35

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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.