Home / 20,421.40-28,183.14-11,470.90

Finding the Fourth Proportional to 20,421.40, 28,183.14 and 11,470.90

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Solution

The fourth proportional to 20,421.40, 28,183.14 and 11,470.90 is: 15,830.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.40 : 28,183.14 = 11,470.90 : x
  2. Step 2: Convert to fraction form
    20,421.40/28,183.14 = 11,470.90/x
  3. Step 3: Cross multiply
    20,421.40x = 28,183.14 × 11,470.90
  4. Step 4: Simplify right side
    20,421.40x = 323,285,980.63
  5. Step 5: Solve for x
    x = 323,285,980.63/20,421.40
  6. Step 6: Final answer
    x = 15,830.75

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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.