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Finding the Fourth Proportional to 78,479.90, 117,719.59 and 21,553.86

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Solution

The fourth proportional to 78,479.90, 117,719.59 and 21,553.86 is: 32,330.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,479.90 : 117,719.59 = 21,553.86 : x
  2. Step 2: Convert to fraction form
    78,479.90/117,719.59 = 21,553.86/x
  3. Step 3: Cross multiply
    78,479.90x = 117,719.59 × 21,553.86
  4. Step 4: Simplify right side
    78,479.90x = 2,537,311,303.44
  5. Step 5: Solve for x
    x = 2,537,311,303.44/78,479.90
  6. Step 6: Final answer
    x = 32,330.71

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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.