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Finding the Fourth Proportional to 21,955.30, 32,933.03 and 5,315.31

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Solution

The fourth proportional to 21,955.30, 32,933.03 and 5,315.31 is: 7,972.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,955.30 : 32,933.03 = 5,315.31 : x
  2. Step 2: Convert to fraction form
    21,955.30/32,933.03 = 5,315.31/x
  3. Step 3: Cross multiply
    21,955.30x = 32,933.03 × 5,315.31
  4. Step 4: Simplify right side
    21,955.30x = 175,049,220.70
  5. Step 5: Solve for x
    x = 175,049,220.70/21,955.30
  6. Step 6: Final answer
    x = 7,972.98

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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.