Home / 20,430.80-28,189.44-12,470.12

Finding the Fourth Proportional to 20,430.80, 28,189.44 and 12,470.12

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Solution

The fourth proportional to 20,430.80, 28,189.44 and 12,470.12 is: 17,205.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.80 : 28,189.44 = 12,470.12 : x
  2. Step 2: Convert to fraction form
    20,430.80/28,189.44 = 12,470.12/x
  3. Step 3: Cross multiply
    20,430.80x = 28,189.44 × 12,470.12
  4. Step 4: Simplify right side
    20,430.80x = 351,525,699.53
  5. Step 5: Solve for x
    x = 351,525,699.53/20,430.80
  6. Step 6: Final answer
    x = 17,205.67

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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.