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Finding the Fourth Proportional to 20,486.79, 30,730.05 and 11,715.48

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Solution

The fourth proportional to 20,486.79, 30,730.05 and 11,715.48 is: 17,573.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,486.79 : 30,730.05 = 11,715.48 : x
  2. Step 2: Convert to fraction form
    20,486.79/30,730.05 = 11,715.48/x
  3. Step 3: Cross multiply
    20,486.79x = 30,730.05 × 11,715.48
  4. Step 4: Simplify right side
    20,486.79x = 360,017,286.17
  5. Step 5: Solve for x
    x = 360,017,286.17/20,486.79
  6. Step 6: Final answer
    x = 17,573.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.