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Finding the Fourth Proportional to 21,805.80, 32,708.70 and 18,695.40

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Solution

The fourth proportional to 21,805.80, 32,708.70 and 18,695.40 is: 28,043.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,805.80 : 32,708.70 = 18,695.40 : x
  2. Step 2: Convert to fraction form
    21,805.80/32,708.70 = 18,695.40/x
  3. Step 3: Cross multiply
    21,805.80x = 32,708.70 × 18,695.40
  4. Step 4: Simplify right side
    21,805.80x = 611,502,229.98
  5. Step 5: Solve for x
    x = 611,502,229.98/21,805.80
  6. Step 6: Final answer
    x = 28,043.10

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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.