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Finding the Fourth Proportional to 10,998.96, 15,185.72 and 8,987.28

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Solution

The fourth proportional to 10,998.96, 15,185.72 and 8,987.28 is: 12,408.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,998.96 : 15,185.72 = 8,987.28 : x
  2. Step 2: Convert to fraction form
    10,998.96/15,185.72 = 8,987.28/x
  3. Step 3: Cross multiply
    10,998.96x = 15,185.72 × 8,987.28
  4. Step 4: Simplify right side
    10,998.96x = 136,478,317.64
  5. Step 5: Solve for x
    x = 136,478,317.64/10,998.96
  6. Step 6: Final answer
    x = 12,408.29

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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.