Home / 20,430.81-28,190.90-12,475.59

Finding the Fourth Proportional to 20,430.81, 28,190.90 and 12,475.59

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Solution

The fourth proportional to 20,430.81, 28,190.90 and 12,475.59 is: 17,214.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.81 : 28,190.90 = 12,475.59 : x
  2. Step 2: Convert to fraction form
    20,430.81/28,190.90 = 12,475.59/x
  3. Step 3: Cross multiply
    20,430.81x = 28,190.90 × 12,475.59
  4. Step 4: Simplify right side
    20,430.81x = 351,698,047.75
  5. Step 5: Solve for x
    x = 351,698,047.75/20,430.81
  6. Step 6: Final answer
    x = 17,214.11

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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.