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Finding the Fourth Proportional to 20,899.80, 28,812.39 and 17,700.30

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Solution

The fourth proportional to 20,899.80, 28,812.39 and 17,700.30 is: 24,401.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,899.80 : 28,812.39 = 17,700.30 : x
  2. Step 2: Convert to fraction form
    20,899.80/28,812.39 = 17,700.30/x
  3. Step 3: Cross multiply
    20,899.80x = 28,812.39 × 17,700.30
  4. Step 4: Simplify right side
    20,899.80x = 509,987,946.72
  5. Step 5: Solve for x
    x = 509,987,946.72/20,899.80
  6. Step 6: Final answer
    x = 24,401.57

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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.