Home / 20,406.40-28,153.92-12,958.72

Finding the Fourth Proportional to 20,406.40, 28,153.92 and 12,958.72

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Solution

The fourth proportional to 20,406.40, 28,153.92 and 12,958.72 is: 17,878.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,406.40 : 28,153.92 = 12,958.72 : x
  2. Step 2: Convert to fraction form
    20,406.40/28,153.92 = 12,958.72/x
  3. Step 3: Cross multiply
    20,406.40x = 28,153.92 × 12,958.72
  4. Step 4: Simplify right side
    20,406.40x = 364,838,766.18
  5. Step 5: Solve for x
    x = 364,838,766.18/20,406.40
  6. Step 6: Final answer
    x = 17,878.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.