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Finding the Fourth Proportional to 21,016.80, 31,525.92 and 7,164

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Solution

The fourth proportional to 21,016.80, 31,525.92 and 7,164 is: 10,746.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,016.80 : 31,525.92 = 7,164 : x
  2. Step 2: Convert to fraction form
    21,016.80/31,525.92 = 7,164/x
  3. Step 3: Cross multiply
    21,016.80x = 31,525.92 × 7,164
  4. Step 4: Simplify right side
    21,016.80x = 225,851,690.88
  5. Step 5: Solve for x
    x = 225,851,690.88/21,016.80
  6. Step 6: Final answer
    x = 10,746.25

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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.