Home / 13,890.15-20,820.65-9,992.43

Finding the Fourth Proportional to 13,890.15, 20,820.65 and 9,992.43

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Solution

The fourth proportional to 13,890.15, 20,820.65 and 9,992.43 is: 14,978.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,890.15 : 20,820.65 = 9,992.43 : x
  2. Step 2: Convert to fraction form
    13,890.15/20,820.65 = 9,992.43/x
  3. Step 3: Cross multiply
    13,890.15x = 20,820.65 × 9,992.43
  4. Step 4: Simplify right side
    13,890.15x = 208,048,837.72
  5. Step 5: Solve for x
    x = 208,048,837.72/13,890.15
  6. Step 6: Final answer
    x = 14,978.16

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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.