Home / 20,428.49-28,191.70-11,354.70

Finding the Fourth Proportional to 20,428.49, 28,191.70 and 11,354.70

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Solution

The fourth proportional to 20,428.49, 28,191.70 and 11,354.70 is: 15,669.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,428.49 : 28,191.70 = 11,354.70 : x
  2. Step 2: Convert to fraction form
    20,428.49/28,191.70 = 11,354.70/x
  3. Step 3: Cross multiply
    20,428.49x = 28,191.70 × 11,354.70
  4. Step 4: Simplify right side
    20,428.49x = 320,108,415.90
  5. Step 5: Solve for x
    x = 320,108,415.90/20,428.49
  6. Step 6: Final answer
    x = 15,669.70

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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.