Home / 20,829.78-31,389.57-18,856.01

Finding the Fourth Proportional to 20,829.78, 31,389.57 and 18,856.01

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Solution

The fourth proportional to 20,829.78, 31,389.57 and 18,856.01 is: 28,415.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,829.78 : 31,389.57 = 18,856.01 : x
  2. Step 2: Convert to fraction form
    20,829.78/31,389.57 = 18,856.01/x
  3. Step 3: Cross multiply
    20,829.78x = 31,389.57 × 18,856.01
  4. Step 4: Simplify right side
    20,829.78x = 591,882,124.29
  5. Step 5: Solve for x
    x = 591,882,124.29/20,829.78
  6. Step 6: Final answer
    x = 28,415.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.