Home / 18,915.30-26,085.87-15,138.81

Finding the Fourth Proportional to 18,915.30, 26,085.87 and 15,138.81

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Solution

The fourth proportional to 18,915.30, 26,085.87 and 15,138.81 is: 20,877.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,915.30 : 26,085.87 = 15,138.81 : x
  2. Step 2: Convert to fraction form
    18,915.30/26,085.87 = 15,138.81/x
  3. Step 3: Cross multiply
    18,915.30x = 26,085.87 × 15,138.81
  4. Step 4: Simplify right side
    18,915.30x = 394,909,029.61
  5. Step 5: Solve for x
    x = 394,909,029.61/18,915.30
  6. Step 6: Final answer
    x = 20,877.76

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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.