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Finding the Fourth Proportional to 21,788.79, 32,696.98 and 9,308.87

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Solution

The fourth proportional to 21,788.79, 32,696.98 and 9,308.87 is: 13,969.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,788.79 : 32,696.98 = 9,308.87 : x
  2. Step 2: Convert to fraction form
    21,788.79/32,696.98 = 9,308.87/x
  3. Step 3: Cross multiply
    21,788.79x = 32,696.98 × 9,308.87
  4. Step 4: Simplify right side
    21,788.79x = 304,371,872.07
  5. Step 5: Solve for x
    x = 304,371,872.07/21,788.79
  6. Step 6: Final answer
    x = 13,969.20

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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.