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Finding the Fourth Proportional to 19,589.80, 29,384.70 and 11,813.80

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Solution

The fourth proportional to 19,589.80, 29,384.70 and 11,813.80 is: 17,720.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,589.80 : 29,384.70 = 11,813.80 : x
  2. Step 2: Convert to fraction form
    19,589.80/29,384.70 = 11,813.80/x
  3. Step 3: Cross multiply
    19,589.80x = 29,384.70 × 11,813.80
  4. Step 4: Simplify right side
    19,589.80x = 347,144,968.86
  5. Step 5: Solve for x
    x = 347,144,968.86/19,589.80
  6. Step 6: Final answer
    x = 17,720.70

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1.5x scale

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.