Home / 21,018.87-31,294.94-20,724.66

Finding the Fourth Proportional to 21,018.87, 31,294.94 and 20,724.66

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Solution

The fourth proportional to 21,018.87, 31,294.94 and 20,724.66 is: 30,856.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,018.87 : 31,294.94 = 20,724.66 : x
  2. Step 2: Convert to fraction form
    21,018.87/31,294.94 = 20,724.66/x
  3. Step 3: Cross multiply
    21,018.87x = 31,294.94 × 20,724.66
  4. Step 4: Simplify right side
    21,018.87x = 648,576,887.60
  5. Step 5: Solve for x
    x = 648,576,887.60/21,018.87
  6. Step 6: Final answer
    x = 30,856.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.