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Finding the Fourth Proportional to 15,699.92, 21,666.16 and 8,626.64

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Solution

The fourth proportional to 15,699.92, 21,666.16 and 8,626.64 is: 11,904.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,699.92 : 21,666.16 = 8,626.64 : x
  2. Step 2: Convert to fraction form
    15,699.92/21,666.16 = 8,626.64/x
  3. Step 3: Cross multiply
    15,699.92x = 21,666.16 × 8,626.64
  4. Step 4: Simplify right side
    15,699.92x = 186,906,162.50
  5. Step 5: Solve for x
    x = 186,906,162.50/15,699.92
  6. Step 6: Final answer
    x = 11,904.91

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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.