Home / 30,489.36-42,018.31-21,976.76

Finding the Fourth Proportional to 30,489.36, 42,018.31 and 21,976.76

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Solution

The fourth proportional to 30,489.36, 42,018.31 and 21,976.76 is: 30,286.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,489.36 : 42,018.31 = 21,976.76 : x
  2. Step 2: Convert to fraction form
    30,489.36/42,018.31 = 21,976.76/x
  3. Step 3: Cross multiply
    30,489.36x = 42,018.31 × 21,976.76
  4. Step 4: Simplify right side
    30,489.36x = 923,426,314.48
  5. Step 5: Solve for x
    x = 923,426,314.48/30,489.36
  6. Step 6: Final answer
    x = 30,286.84

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Double scale
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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.