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Finding the Fourth Proportional to 13,668.59, 18,868.98 and 9,638.70

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Solution

The fourth proportional to 13,668.59, 18,868.98 and 9,638.70 is: 13,305.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,668.59 : 18,868.98 = 9,638.70 : x
  2. Step 2: Convert to fraction form
    13,668.59/18,868.98 = 9,638.70/x
  3. Step 3: Cross multiply
    13,668.59x = 18,868.98 × 9,638.70
  4. Step 4: Simplify right side
    13,668.59x = 181,872,382.58
  5. Step 5: Solve for x
    x = 181,872,382.58/13,668.59
  6. Step 6: Final answer
    x = 13,305.87

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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.