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Finding the Fourth Proportional to 15,189.87, 20,915.24 and 12,946.71

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Solution

The fourth proportional to 15,189.87, 20,915.24 and 12,946.71 is: 17,826.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,189.87 : 20,915.24 = 12,946.71 : x
  2. Step 2: Convert to fraction form
    15,189.87/20,915.24 = 12,946.71/x
  3. Step 3: Cross multiply
    15,189.87x = 20,915.24 × 12,946.71
  4. Step 4: Simplify right side
    15,189.87x = 270,783,482.13
  5. Step 5: Solve for x
    x = 270,783,482.13/15,189.87
  6. Step 6: Final answer
    x = 17,826.58

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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.