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Finding the Fourth Proportional to 13,657.70, 18,849.44 and 7,690.55

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Solution

The fourth proportional to 13,657.70, 18,849.44 and 7,690.55 is: 10,613.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,657.70 : 18,849.44 = 7,690.55 : x
  2. Step 2: Convert to fraction form
    13,657.70/18,849.44 = 7,690.55/x
  3. Step 3: Cross multiply
    13,657.70x = 18,849.44 × 7,690.55
  4. Step 4: Simplify right side
    13,657.70x = 144,962,485.77
  5. Step 5: Solve for x
    x = 144,962,485.77/13,657.70
  6. Step 6: Final answer
    x = 10,613.97

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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.