Home / 10,920.40-16,390.20-8,731.60

Finding the Fourth Proportional to 10,920.40, 16,390.20 and 8,731.60

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Solution

The fourth proportional to 10,920.40, 16,390.20 and 8,731.60 is: 13,105.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,920.40 : 16,390.20 = 8,731.60 : x
  2. Step 2: Convert to fraction form
    10,920.40/16,390.20 = 8,731.60/x
  3. Step 3: Cross multiply
    10,920.40x = 16,390.20 × 8,731.60
  4. Step 4: Simplify right side
    10,920.40x = 143,112,670.32
  5. Step 5: Solve for x
    x = 143,112,670.32/10,920.40
  6. Step 6: Final answer
    x = 13,105.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.