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Finding the Fourth Proportional to 13,690.65, 18,893.21 and 7,558.55

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Solution

The fourth proportional to 13,690.65, 18,893.21 and 7,558.55 is: 10,430.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.65 : 18,893.21 = 7,558.55 : x
  2. Step 2: Convert to fraction form
    13,690.65/18,893.21 = 7,558.55/x
  3. Step 3: Cross multiply
    13,690.65x = 18,893.21 × 7,558.55
  4. Step 4: Simplify right side
    13,690.65x = 142,805,272.45
  5. Step 5: Solve for x
    x = 142,805,272.45/13,690.65
  6. Step 6: Final answer
    x = 10,430.86

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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.