Home / 31,420.32-43,362-21,991.92

Finding the Fourth Proportional to 31,420.32, 43,362 and 21,991.92

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Solution

The fourth proportional to 31,420.32, 43,362 and 21,991.92 is: 30,350.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,420.32 : 43,362 = 21,991.92 : x
  2. Step 2: Convert to fraction form
    31,420.32/43,362 = 21,991.92/x
  3. Step 3: Cross multiply
    31,420.32x = 43,362 × 21,991.92
  4. Step 4: Simplify right side
    31,420.32x = 953,613,635.04
  5. Step 5: Solve for x
    x = 953,613,635.04/31,420.32
  6. Step 6: Final answer
    x = 30,350.22

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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.