Home / 13,620.29-20,420.05-7,042.28

Finding the Fourth Proportional to 13,620.29, 20,420.05 and 7,042.28

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Solution

The fourth proportional to 13,620.29, 20,420.05 and 7,042.28 is: 10,558.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,620.29 : 20,420.05 = 7,042.28 : x
  2. Step 2: Convert to fraction form
    13,620.29/20,420.05 = 7,042.28/x
  3. Step 3: Cross multiply
    13,620.29x = 20,420.05 × 7,042.28
  4. Step 4: Simplify right side
    13,620.29x = 143,803,709.71
  5. Step 5: Solve for x
    x = 143,803,709.71/13,620.29
  6. Step 6: Final answer
    x = 10,558.05

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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.