Home / 20,612.81-28,428.14-15,844.32

Finding the Fourth Proportional to 20,612.81, 28,428.14 and 15,844.32

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Solution

The fourth proportional to 20,612.81, 28,428.14 and 15,844.32 is: 21,851.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,612.81 : 28,428.14 = 15,844.32 : x
  2. Step 2: Convert to fraction form
    20,612.81/28,428.14 = 15,844.32/x
  3. Step 3: Cross multiply
    20,612.81x = 28,428.14 × 15,844.32
  4. Step 4: Simplify right side
    20,612.81x = 450,424,586.78
  5. Step 5: Solve for x
    x = 450,424,586.78/20,612.81
  6. Step 6: Final answer
    x = 21,851.68

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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.