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Finding the Fourth Proportional to 13,613.40, 18,787.88 and 7,645.59

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Solution

The fourth proportional to 13,613.40, 18,787.88 and 7,645.59 is: 10,551.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,613.40 : 18,787.88 = 7,645.59 : x
  2. Step 2: Convert to fraction form
    13,613.40/18,787.88 = 7,645.59/x
  3. Step 3: Cross multiply
    13,613.40x = 18,787.88 × 7,645.59
  4. Step 4: Simplify right side
    13,613.40x = 143,644,446.56
  5. Step 5: Solve for x
    x = 143,644,446.56/13,613.40
  6. Step 6: Final answer
    x = 10,551.70

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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.