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Finding the Fourth Proportional to 11,965.50, 16,506.72 and 8,430.66

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Solution

The fourth proportional to 11,965.50, 16,506.72 and 8,430.66 is: 11,630.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,965.50 : 16,506.72 = 8,430.66 : x
  2. Step 2: Convert to fraction form
    11,965.50/16,506.72 = 8,430.66/x
  3. Step 3: Cross multiply
    11,965.50x = 16,506.72 × 8,430.66
  4. Step 4: Simplify right side
    11,965.50x = 139,162,544.04
  5. Step 5: Solve for x
    x = 139,162,544.04/11,965.50
  6. Step 6: Final answer
    x = 11,630.32

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Double scale
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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.