Home / 21,144-31,686-14,474.40

Finding the Fourth Proportional to 21,144, 31,686 and 14,474.40

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Solution

The fourth proportional to 21,144, 31,686 and 14,474.40 is: 21,691.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,144 : 31,686 = 14,474.40 : x
  2. Step 2: Convert to fraction form
    21,144/31,686 = 14,474.40/x
  3. Step 3: Cross multiply
    21,144x = 31,686 × 14,474.40
  4. Step 4: Simplify right side
    21,144x = 458,635,838.40
  5. Step 5: Solve for x
    x = 458,635,838.40/21,144
  6. Step 6: Final answer
    x = 21,691.06

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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.