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Finding the Fourth Proportional to 12,309.79, 16,987.47 and 6,720.79

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Solution

The fourth proportional to 12,309.79, 16,987.47 and 6,720.79 is: 9,274.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,309.79 : 16,987.47 = 6,720.79 : x
  2. Step 2: Convert to fraction form
    12,309.79/16,987.47 = 6,720.79/x
  3. Step 3: Cross multiply
    12,309.79x = 16,987.47 × 6,720.79
  4. Step 4: Simplify right side
    12,309.79x = 114,169,218.50
  5. Step 5: Solve for x
    x = 114,169,218.50/12,309.79
  6. Step 6: Final answer
    x = 9,274.67

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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.