Home / 20,421.64-28,176.91-11,918.90

Finding the Fourth Proportional to 20,421.64, 28,176.91 and 11,918.90

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Solution

The fourth proportional to 20,421.64, 28,176.91 and 11,918.90 is: 16,445.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.64 : 28,176.91 = 11,918.90 : x
  2. Step 2: Convert to fraction form
    20,421.64/28,176.91 = 11,918.90/x
  3. Step 3: Cross multiply
    20,421.64x = 28,176.91 × 11,918.90
  4. Step 4: Simplify right side
    20,421.64x = 335,837,601.92
  5. Step 5: Solve for x
    x = 335,837,601.92/20,421.64
  6. Step 6: Final answer
    x = 16,445.18

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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.