Home / 20,421.86-28,184.78-12,462.40

Finding the Fourth Proportional to 20,421.86, 28,184.78 and 12,462.40

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Solution

The fourth proportional to 20,421.86, 28,184.78 and 12,462.40 is: 17,199.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.86 : 28,184.78 = 12,462.40 : x
  2. Step 2: Convert to fraction form
    20,421.86/28,184.78 = 12,462.40/x
  3. Step 3: Cross multiply
    20,421.86x = 28,184.78 × 12,462.40
  4. Step 4: Simplify right side
    20,421.86x = 351,250,002.27
  5. Step 5: Solve for x
    x = 351,250,002.27/20,421.86
  6. Step 6: Final answer
    x = 17,199.71

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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.