Home / 22,815.09-31,499.64-20,420.91

Finding the Fourth Proportional to 22,815.09, 31,499.64 and 20,420.91

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Solution

The fourth proportional to 22,815.09, 31,499.64 and 20,420.91 is: 28,194.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,815.09 : 31,499.64 = 20,420.91 : x
  2. Step 2: Convert to fraction form
    22,815.09/31,499.64 = 20,420.91/x
  3. Step 3: Cross multiply
    22,815.09x = 31,499.64 × 20,420.91
  4. Step 4: Simplify right side
    22,815.09x = 643,251,313.47
  5. Step 5: Solve for x
    x = 643,251,313.47/22,815.09
  6. Step 6: Final answer
    x = 28,194.12

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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.