Home / 13,421.85-20,140.69-5,108.86

Finding the Fourth Proportional to 13,421.85, 20,140.69 and 5,108.86

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Solution

The fourth proportional to 13,421.85, 20,140.69 and 5,108.86 is: 7,666.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.85 : 20,140.69 = 5,108.86 : x
  2. Step 2: Convert to fraction form
    13,421.85/20,140.69 = 5,108.86/x
  3. Step 3: Cross multiply
    13,421.85x = 20,140.69 × 5,108.86
  4. Step 4: Simplify right side
    13,421.85x = 102,895,965.51
  5. Step 5: Solve for x
    x = 102,895,965.51/13,421.85
  6. Step 6: Final answer
    x = 7,666.30

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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.