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Finding the Fourth Proportional to 12,309.16, 16,986.55 and 6,720.16

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Solution

The fourth proportional to 12,309.16, 16,986.55 and 6,720.16 is: 9,273.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,309.16 : 16,986.55 = 6,720.16 : x
  2. Step 2: Convert to fraction form
    12,309.16/16,986.55 = 6,720.16/x
  3. Step 3: Cross multiply
    12,309.16x = 16,986.55 × 6,720.16
  4. Step 4: Simplify right side
    12,309.16x = 114,152,215.31
  5. Step 5: Solve for x
    x = 114,152,215.31/12,309.16
  6. Step 6: Final answer
    x = 9,273.77

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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.