Home / 13,420.30-20,136.14-7,178.69

Finding the Fourth Proportional to 13,420.30, 20,136.14 and 7,178.69

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Solution

The fourth proportional to 13,420.30, 20,136.14 and 7,178.69 is: 10,771.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,420.30 : 20,136.14 = 7,178.69 : x
  2. Step 2: Convert to fraction form
    13,420.30/20,136.14 = 7,178.69/x
  3. Step 3: Cross multiply
    13,420.30x = 20,136.14 × 7,178.69
  4. Step 4: Simplify right side
    13,420.30x = 144,551,106.86
  5. Step 5: Solve for x
    x = 144,551,106.86/13,420.30
  6. Step 6: Final answer
    x = 10,771.08

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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.