Home / 20,612.81-28,445.68-11,181.38

Finding the Fourth Proportional to 20,612.81, 28,445.68 and 11,181.38

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Solution

The fourth proportional to 20,612.81, 28,445.68 and 11,181.38 is: 15,430.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,612.81 : 28,445.68 = 11,181.38 : x
  2. Step 2: Convert to fraction form
    20,612.81/28,445.68 = 11,181.38/x
  3. Step 3: Cross multiply
    20,612.81x = 28,445.68 × 11,181.38
  4. Step 4: Simplify right side
    20,612.81x = 318,061,829.19
  5. Step 5: Solve for x
    x = 318,061,829.19/20,612.81
  6. Step 6: Final answer
    x = 15,430.30

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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.