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Finding the Fourth Proportional to 15,124.83, 20,877.90 and 12,991.79

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Solution

The fourth proportional to 15,124.83, 20,877.90 and 12,991.79 is: 17,933.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,124.83 : 20,877.90 = 12,991.79 : x
  2. Step 2: Convert to fraction form
    15,124.83/20,877.90 = 12,991.79/x
  3. Step 3: Cross multiply
    15,124.83x = 20,877.90 × 12,991.79
  4. Step 4: Simplify right side
    15,124.83x = 271,241,369.00
  5. Step 5: Solve for x
    x = 271,241,369.00/15,124.83
  6. Step 6: Final answer
    x = 17,933.52

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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.