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Finding the Fourth Proportional to 15,157.96, 20,919.60 and 8,875.60

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Solution

The fourth proportional to 15,157.96, 20,919.60 and 8,875.60 is: 12,249.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,157.96 : 20,919.60 = 8,875.60 : x
  2. Step 2: Convert to fraction form
    15,157.96/20,919.60 = 8,875.60/x
  3. Step 3: Cross multiply
    15,157.96x = 20,919.60 × 8,875.60
  4. Step 4: Simplify right side
    15,157.96x = 185,674,001.76
  5. Step 5: Solve for x
    x = 185,674,001.76/15,157.96
  6. Step 6: Final answer
    x = 12,249.27

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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.