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Finding the Fourth Proportional to 18,719.84, 28,021.36 and 15,920.48

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Solution

The fourth proportional to 18,719.84, 28,021.36 and 15,920.48 is: 23,831.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.84 : 28,021.36 = 15,920.48 : x
  2. Step 2: Convert to fraction form
    18,719.84/28,021.36 = 15,920.48/x
  3. Step 3: Cross multiply
    18,719.84x = 28,021.36 × 15,920.48
  4. Step 4: Simplify right side
    18,719.84x = 446,113,501.45
  5. Step 5: Solve for x
    x = 446,113,501.45/18,719.84
  6. Step 6: Final answer
    x = 23,831.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.