Home / 20,428.60-28,189.74-11,475.40

Finding the Fourth Proportional to 20,428.60, 28,189.74 and 11,475.40

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Solution

The fourth proportional to 20,428.60, 28,189.74 and 11,475.40 is: 15,835.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428.60 : 28,189.74 = 11,475.40 : x
  2. Step 2: Convert to fraction form
    20,428.60/28,189.74 = 11,475.40/x
  3. Step 3: Cross multiply
    20,428.60x = 28,189.74 × 11,475.40
  4. Step 4: Simplify right side
    20,428.60x = 323,488,542.40
  5. Step 5: Solve for x
    x = 323,488,542.40/20,428.60
  6. Step 6: Final answer
    x = 15,835.08

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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.