Home / 20,390.70-28,121.67-13,214.10

Finding the Fourth Proportional to 20,390.70, 28,121.67 and 13,214.10

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Solution

The fourth proportional to 20,390.70, 28,121.67 and 13,214.10 is: 18,224.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.70 : 28,121.67 = 13,214.10 : x
  2. Step 2: Convert to fraction form
    20,390.70/28,121.67 = 13,214.10/x
  3. Step 3: Cross multiply
    20,390.70x = 28,121.67 × 13,214.10
  4. Step 4: Simplify right side
    20,390.70x = 371,602,559.55
  5. Step 5: Solve for x
    x = 371,602,559.55/20,390.70
  6. Step 6: Final answer
    x = 18,224.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.