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Finding the Fourth Proportional to 21,758.55, 32,631.74 and 7,716.79

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Solution

The fourth proportional to 21,758.55, 32,631.74 and 7,716.79 is: 11,573.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,758.55 : 32,631.74 = 7,716.79 : x
  2. Step 2: Convert to fraction form
    21,758.55/32,631.74 = 7,716.79/x
  3. Step 3: Cross multiply
    21,758.55x = 32,631.74 × 7,716.79
  4. Step 4: Simplify right side
    21,758.55x = 251,812,284.91
  5. Step 5: Solve for x
    x = 251,812,284.91/21,758.55
  6. Step 6: Final answer
    x = 11,573.03

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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.