Home / 12,090.22-16,680.23-7,900.90

Finding the Fourth Proportional to 12,090.22, 16,680.23 and 7,900.90

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Solution

The fourth proportional to 12,090.22, 16,680.23 and 7,900.90 is: 10,900.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,090.22 : 16,680.23 = 7,900.90 : x
  2. Step 2: Convert to fraction form
    12,090.22/16,680.23 = 7,900.90/x
  3. Step 3: Cross multiply
    12,090.22x = 16,680.23 × 7,900.90
  4. Step 4: Simplify right side
    12,090.22x = 131,788,779.28
  5. Step 5: Solve for x
    x = 131,788,779.28/12,090.22
  6. Step 6: Final answer
    x = 10,900.45

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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.