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Finding the Fourth Proportional to 21,607.86, 29,821.57 and 12,658.78

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Solution

The fourth proportional to 21,607.86, 29,821.57 and 12,658.78 is: 17,470.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,607.86 : 29,821.57 = 12,658.78 : x
  2. Step 2: Convert to fraction form
    21,607.86/29,821.57 = 12,658.78/x
  3. Step 3: Cross multiply
    21,607.86x = 29,821.57 × 12,658.78
  4. Step 4: Simplify right side
    21,607.86x = 377,504,699.51
  5. Step 5: Solve for x
    x = 377,504,699.51/21,607.86
  6. Step 6: Final answer
    x = 17,470.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.