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Finding the Fourth Proportional to 21,011.67, 28,994.40 and 11,580.30

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Solution

The fourth proportional to 21,011.67, 28,994.40 and 11,580.30 is: 15,979.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.67 : 28,994.40 = 11,580.30 : x
  2. Step 2: Convert to fraction form
    21,011.67/28,994.40 = 11,580.30/x
  3. Step 3: Cross multiply
    21,011.67x = 28,994.40 × 11,580.30
  4. Step 4: Simplify right side
    21,011.67x = 335,763,850.32
  5. Step 5: Solve for x
    x = 335,763,850.32/21,011.67
  6. Step 6: Final answer
    x = 15,979.87

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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.