Home / 20,283.15-27,990.45-11,330.78

Finding the Fourth Proportional to 20,283.15, 27,990.45 and 11,330.78

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Solution

The fourth proportional to 20,283.15, 27,990.45 and 11,330.78 is: 15,636.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,283.15 : 27,990.45 = 11,330.78 : x
  2. Step 2: Convert to fraction form
    20,283.15/27,990.45 = 11,330.78/x
  3. Step 3: Cross multiply
    20,283.15x = 27,990.45 × 11,330.78
  4. Step 4: Simplify right side
    20,283.15x = 317,153,491.10
  5. Step 5: Solve for x
    x = 317,153,491.10/20,283.15
  6. Step 6: Final answer
    x = 15,636.30

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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.