Home / 20,919.72-28,867.83-12,421.40

Finding the Fourth Proportional to 20,919.72, 28,867.83 and 12,421.40

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Solution

The fourth proportional to 20,919.72, 28,867.83 and 12,421.40 is: 17,140.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.72 : 28,867.83 = 12,421.40 : x
  2. Step 2: Convert to fraction form
    20,919.72/28,867.83 = 12,421.40/x
  3. Step 3: Cross multiply
    20,919.72x = 28,867.83 × 12,421.40
  4. Step 4: Simplify right side
    20,919.72x = 358,578,822.45
  5. Step 5: Solve for x
    x = 358,578,822.45/20,919.72
  6. Step 6: Final answer
    x = 17,140.71

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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.