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Finding the Fourth Proportional to 13,628.40, 20,455.65 and 7,059.30

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Solution

The fourth proportional to 13,628.40, 20,455.65 and 7,059.30 is: 10,595.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,628.40 : 20,455.65 = 7,059.30 : x
  2. Step 2: Convert to fraction form
    13,628.40/20,455.65 = 7,059.30/x
  3. Step 3: Cross multiply
    13,628.40x = 20,455.65 × 7,059.30
  4. Step 4: Simplify right side
    13,628.40x = 144,402,570.05
  5. Step 5: Solve for x
    x = 144,402,570.05/13,628.40
  6. Step 6: Final answer
    x = 10,595.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.