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Finding the Fourth Proportional to 15,207.79, 20,979.46 and 9,539.69

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Solution

The fourth proportional to 15,207.79, 20,979.46 and 9,539.69 is: 13,160.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,207.79 : 20,979.46 = 9,539.69 : x
  2. Step 2: Convert to fraction form
    15,207.79/20,979.46 = 9,539.69/x
  3. Step 3: Cross multiply
    15,207.79x = 20,979.46 × 9,539.69
  4. Step 4: Simplify right side
    15,207.79x = 200,137,544.77
  5. Step 5: Solve for x
    x = 200,137,544.77/15,207.79
  6. Step 6: Final answer
    x = 13,160.20

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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.