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Finding the Fourth Proportional to 21,010.28, 31,509.92 and 9,914.04

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Solution

The fourth proportional to 21,010.28, 31,509.92 and 9,914.04 is: 14,868.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,010.28 : 31,509.92 = 9,914.04 : x
  2. Step 2: Convert to fraction form
    21,010.28/31,509.92 = 9,914.04/x
  3. Step 3: Cross multiply
    21,010.28x = 31,509.92 × 9,914.04
  4. Step 4: Simplify right side
    21,010.28x = 312,390,607.28
  5. Step 5: Solve for x
    x = 312,390,607.28/21,010.28
  6. Step 6: Final answer
    x = 14,868.46

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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.