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Finding the Fourth Proportional to 9,861.74, 13,609.09 and 5,385.68

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Solution

The fourth proportional to 9,861.74, 13,609.09 and 5,385.68 is: 7,432.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,861.74 : 13,609.09 = 5,385.68 : x
  2. Step 2: Convert to fraction form
    9,861.74/13,609.09 = 5,385.68/x
  3. Step 3: Cross multiply
    9,861.74x = 13,609.09 × 5,385.68
  4. Step 4: Simplify right side
    9,861.74x = 73,294,203.83
  5. Step 5: Solve for x
    x = 73,294,203.83/9,861.74
  6. Step 6: Final answer
    x = 7,432.18

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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.