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Finding the Fourth Proportional to 21,811.80, 32,717.70 and 18,539.40

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Solution

The fourth proportional to 21,811.80, 32,717.70 and 18,539.40 is: 27,809.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,811.80 : 32,717.70 = 18,539.40 : x
  2. Step 2: Convert to fraction form
    21,811.80/32,717.70 = 18,539.40/x
  3. Step 3: Cross multiply
    21,811.80x = 32,717.70 × 18,539.40
  4. Step 4: Simplify right side
    21,811.80x = 606,566,527.38
  5. Step 5: Solve for x
    x = 606,566,527.38/21,811.80
  6. Step 6: Final answer
    x = 27,809.10

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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.