Home / 13,421.49-20,128.13-6,397.80

Finding the Fourth Proportional to 13,421.49, 20,128.13 and 6,397.80

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Solution

The fourth proportional to 13,421.49, 20,128.13 and 6,397.80 is: 9,594.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.49 : 20,128.13 = 6,397.80 : x
  2. Step 2: Convert to fraction form
    13,421.49/20,128.13 = 6,397.80/x
  3. Step 3: Cross multiply
    13,421.49x = 20,128.13 × 6,397.80
  4. Step 4: Simplify right side
    13,421.49x = 128,775,766.11
  5. Step 5: Solve for x
    x = 128,775,766.11/13,421.49
  6. Step 6: Final answer
    x = 9,594.74

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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.