Home / 13,403.61-20,078.55-6,390.43

Finding the Fourth Proportional to 13,403.61, 20,078.55 and 6,390.43

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Solution

The fourth proportional to 13,403.61, 20,078.55 and 6,390.43 is: 9,572.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,403.61 : 20,078.55 = 6,390.43 : x
  2. Step 2: Convert to fraction form
    13,403.61/20,078.55 = 6,390.43/x
  3. Step 3: Cross multiply
    13,403.61x = 20,078.55 × 6,390.43
  4. Step 4: Simplify right side
    13,403.61x = 128,310,518.08
  5. Step 5: Solve for x
    x = 128,310,518.08/13,403.61
  6. Step 6: Final answer
    x = 9,572.83

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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.