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Finding the Fourth Proportional to 15,221.61, 21,005.69 and 8,507.16

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Solution

The fourth proportional to 15,221.61, 21,005.69 and 8,507.16 is: 11,739.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,221.61 : 21,005.69 = 8,507.16 : x
  2. Step 2: Convert to fraction form
    15,221.61/21,005.69 = 8,507.16/x
  3. Step 3: Cross multiply
    15,221.61x = 21,005.69 × 8,507.16
  4. Step 4: Simplify right side
    15,221.61x = 178,698,765.74
  5. Step 5: Solve for x
    x = 178,698,765.74/15,221.61
  6. Step 6: Final answer
    x = 11,739.81

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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.