Home / 15,500.77-21,390.98-8,427.20

Finding the Fourth Proportional to 15,500.77, 21,390.98 and 8,427.20

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Solution

The fourth proportional to 15,500.77, 21,390.98 and 8,427.20 is: 11,629.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,500.77 : 21,390.98 = 8,427.20 : x
  2. Step 2: Convert to fraction form
    15,500.77/21,390.98 = 8,427.20/x
  3. Step 3: Cross multiply
    15,500.77x = 21,390.98 × 8,427.20
  4. Step 4: Simplify right side
    15,500.77x = 180,265,917.57
  5. Step 5: Solve for x
    x = 180,265,917.57/15,500.77
  6. Step 6: Final answer
    x = 11,629.48

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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.