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Finding the Fourth Proportional to 19,811.20, 29,716.80 and 13,590.40

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Solution

The fourth proportional to 19,811.20, 29,716.80 and 13,590.40 is: 20,385.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,811.20 : 29,716.80 = 13,590.40 : x
  2. Step 2: Convert to fraction form
    19,811.20/29,716.80 = 13,590.40/x
  3. Step 3: Cross multiply
    19,811.20x = 29,716.80 × 13,590.40
  4. Step 4: Simplify right side
    19,811.20x = 403,863,198.72
  5. Step 5: Solve for x
    x = 403,863,198.72/19,811.20
  6. Step 6: Final answer
    x = 20,385.60

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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.