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Finding the Fourth Proportional to 21,624.50, 32,436.75 and 5,208.50

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Solution

The fourth proportional to 21,624.50, 32,436.75 and 5,208.50 is: 7,812.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,624.50 : 32,436.75 = 5,208.50 : x
  2. Step 2: Convert to fraction form
    21,624.50/32,436.75 = 5,208.50/x
  3. Step 3: Cross multiply
    21,624.50x = 32,436.75 × 5,208.50
  4. Step 4: Simplify right side
    21,624.50x = 168,946,812.38
  5. Step 5: Solve for x
    x = 168,946,812.38/21,624.50
  6. Step 6: Final answer
    x = 7,812.75

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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.