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Finding the Fourth Proportional to 20,991.72, 28,994.58 and 15,240

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Solution

The fourth proportional to 20,991.72, 28,994.58 and 15,240 is: 21,050.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.72 : 28,994.58 = 15,240 : x
  2. Step 2: Convert to fraction form
    20,991.72/28,994.58 = 15,240/x
  3. Step 3: Cross multiply
    20,991.72x = 28,994.58 × 15,240
  4. Step 4: Simplify right side
    20,991.72x = 441,877,399.20
  5. Step 5: Solve for x
    x = 441,877,399.20/20,991.72
  6. Step 6: Final answer
    x = 21,050.08

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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.