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Finding the Fourth Proportional to 12,309.48, 16,987.05 and 6,720.48

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Solution

The fourth proportional to 12,309.48, 16,987.05 and 6,720.48 is: 9,274.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,309.48 : 16,987.05 = 6,720.48 : x
  2. Step 2: Convert to fraction form
    12,309.48/16,987.05 = 6,720.48/x
  3. Step 3: Cross multiply
    12,309.48x = 16,987.05 × 6,720.48
  4. Step 4: Simplify right side
    12,309.48x = 114,161,129.78
  5. Step 5: Solve for x
    x = 114,161,129.78/12,309.48
  6. Step 6: Final answer
    x = 9,274.24

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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.