Home / 13,640.90-20,442.30-7,387.40

Finding the Fourth Proportional to 13,640.90, 20,442.30 and 7,387.40

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Solution

The fourth proportional to 13,640.90, 20,442.30 and 7,387.40 is: 11,070.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,640.90 : 20,442.30 = 7,387.40 : x
  2. Step 2: Convert to fraction form
    13,640.90/20,442.30 = 7,387.40/x
  3. Step 3: Cross multiply
    13,640.90x = 20,442.30 × 7,387.40
  4. Step 4: Simplify right side
    13,640.90x = 151,015,447.02
  5. Step 5: Solve for x
    x = 151,015,447.02/13,640.90
  6. Step 6: Final answer
    x = 11,070.78

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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.