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Finding the Fourth Proportional to 20,657.70, 30,986.55 and 18,411.30

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Solution

The fourth proportional to 20,657.70, 30,986.55 and 18,411.30 is: 27,616.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,657.70 : 30,986.55 = 18,411.30 : x
  2. Step 2: Convert to fraction form
    20,657.70/30,986.55 = 18,411.30/x
  3. Step 3: Cross multiply
    20,657.70x = 30,986.55 × 18,411.30
  4. Step 4: Simplify right side
    20,657.70x = 570,502,668.02
  5. Step 5: Solve for x
    x = 570,502,668.02/20,657.70
  6. Step 6: Final answer
    x = 27,616.95

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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.