Home / 20,430.70-28,193.31-11,478.58

Finding the Fourth Proportional to 20,430.70, 28,193.31 and 11,478.58

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Solution

The fourth proportional to 20,430.70, 28,193.31 and 11,478.58 is: 15,839.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.70 : 28,193.31 = 11,478.58 : x
  2. Step 2: Convert to fraction form
    20,430.70/28,193.31 = 11,478.58/x
  3. Step 3: Cross multiply
    20,430.70x = 28,193.31 × 11,478.58
  4. Step 4: Simplify right side
    20,430.70x = 323,619,164.30
  5. Step 5: Solve for x
    x = 323,619,164.30/20,430.70
  6. Step 6: Final answer
    x = 15,839.85

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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.