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Finding the Fourth Proportional to 13,609.70, 18,780.90 and 7,641.62

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Solution

The fourth proportional to 13,609.70, 18,780.90 and 7,641.62 is: 10,545.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.70 : 18,780.90 = 7,641.62 : x
  2. Step 2: Convert to fraction form
    13,609.70/18,780.90 = 7,641.62/x
  3. Step 3: Cross multiply
    13,609.70x = 18,780.90 × 7,641.62
  4. Step 4: Simplify right side
    13,609.70x = 143,516,501.06
  5. Step 5: Solve for x
    x = 143,516,501.06/13,609.70
  6. Step 6: Final answer
    x = 10,545.16

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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.