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Finding the Fourth Proportional to 11,215.30, 16,808.55 and 8,605.30

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Solution

The fourth proportional to 11,215.30, 16,808.55 and 8,605.30 is: 12,896.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,215.30 : 16,808.55 = 8,605.30 : x
  2. Step 2: Convert to fraction form
    11,215.30/16,808.55 = 8,605.30/x
  3. Step 3: Cross multiply
    11,215.30x = 16,808.55 × 8,605.30
  4. Step 4: Simplify right side
    11,215.30x = 144,642,615.32
  5. Step 5: Solve for x
    x = 144,642,615.32/11,215.30
  6. Step 6: Final answer
    x = 12,896.90

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1.5x scale

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.