Home / 21,163.06-31,784.10-18,631.05

Finding the Fourth Proportional to 21,163.06, 31,784.10 and 18,631.05

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Solution

The fourth proportional to 21,163.06, 31,784.10 and 18,631.05 is: 27,981.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,163.06 : 31,784.10 = 18,631.05 : x
  2. Step 2: Convert to fraction form
    21,163.06/31,784.10 = 18,631.05/x
  3. Step 3: Cross multiply
    21,163.06x = 31,784.10 × 18,631.05
  4. Step 4: Simplify right side
    21,163.06x = 592,171,156.31
  5. Step 5: Solve for x
    x = 592,171,156.31/21,163.06
  6. Step 6: Final answer
    x = 27,981.36

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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.