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Finding the Fourth Proportional to 21,156.88, 31,739.76 and 6,366.88

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Solution

The fourth proportional to 21,156.88, 31,739.76 and 6,366.88 is: 9,551.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,156.88 : 31,739.76 = 6,366.88 : x
  2. Step 2: Convert to fraction form
    21,156.88/31,739.76 = 6,366.88/x
  3. Step 3: Cross multiply
    21,156.88x = 31,739.76 × 6,366.88
  4. Step 4: Simplify right side
    21,156.88x = 202,083,243.15
  5. Step 5: Solve for x
    x = 202,083,243.15/21,156.88
  6. Step 6: Final answer
    x = 9,551.66

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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.