Home / 15,321.78-21,145.93-8,607.69

Finding the Fourth Proportional to 15,321.78, 21,145.93 and 8,607.69

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Solution

The fourth proportional to 15,321.78, 21,145.93 and 8,607.69 is: 11,879.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,321.78 : 21,145.93 = 8,607.69 : x
  2. Step 2: Convert to fraction form
    15,321.78/21,145.93 = 8,607.69/x
  3. Step 3: Cross multiply
    15,321.78x = 21,145.93 × 8,607.69
  4. Step 4: Simplify right side
    15,321.78x = 182,017,588.68
  5. Step 5: Solve for x
    x = 182,017,588.68/15,321.78
  6. Step 6: Final answer
    x = 11,879.66

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Half scale
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Double scale
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Similar ratio
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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.