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Finding the Fourth Proportional to 11,979.44, 16,547.20 and 9,129.44

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Solution

The fourth proportional to 11,979.44, 16,547.20 and 9,129.44 is: 12,610.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,979.44 : 16,547.20 = 9,129.44 : x
  2. Step 2: Convert to fraction form
    11,979.44/16,547.20 = 9,129.44/x
  3. Step 3: Cross multiply
    11,979.44x = 16,547.20 × 9,129.44
  4. Step 4: Simplify right side
    11,979.44x = 151,066,669.57
  5. Step 5: Solve for x
    x = 151,066,669.57/11,979.44
  6. Step 6: Final answer
    x = 12,610.50

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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.