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Finding the Fourth Proportional to 76,572.16, 114,860.40 and 21,168.16

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Solution

The fourth proportional to 76,572.16, 114,860.40 and 21,168.16 is: 31,752.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,572.16 : 114,860.40 = 21,168.16 : x
  2. Step 2: Convert to fraction form
    76,572.16/114,860.40 = 21,168.16/x
  3. Step 3: Cross multiply
    76,572.16x = 114,860.40 × 21,168.16
  4. Step 4: Simplify right side
    76,572.16x = 2,431,383,324.86
  5. Step 5: Solve for x
    x = 2,431,383,324.86/76,572.16
  6. Step 6: Final answer
    x = 31,752.84

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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.