Home / 21,021.41-31,516.32-9,921.78

Finding the Fourth Proportional to 21,021.41, 31,516.32 and 9,921.78

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Solution

The fourth proportional to 21,021.41, 31,516.32 and 9,921.78 is: 14,875.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,021.41 : 31,516.32 = 9,921.78 : x
  2. Step 2: Convert to fraction form
    21,021.41/31,516.32 = 9,921.78/x
  3. Step 3: Cross multiply
    21,021.41x = 31,516.32 × 9,921.78
  4. Step 4: Simplify right side
    21,021.41x = 312,697,993.45
  5. Step 5: Solve for x
    x = 312,697,993.45/21,021.41
  6. Step 6: Final answer
    x = 14,875.22

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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.