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Finding the Fourth Proportional to 18,995.88, 26,189.88 and 15,580.32

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Solution

The fourth proportional to 18,995.88, 26,189.88 and 15,580.32 is: 21,480.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,995.88 : 26,189.88 = 15,580.32 : x
  2. Step 2: Convert to fraction form
    18,995.88/26,189.88 = 15,580.32/x
  3. Step 3: Cross multiply
    18,995.88x = 26,189.88 × 15,580.32
  4. Step 4: Simplify right side
    18,995.88x = 408,046,711.16
  5. Step 5: Solve for x
    x = 408,046,711.16/18,995.88
  6. Step 6: Final answer
    x = 21,480.80

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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.