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Finding the Fourth Proportional to 15,125.76, 20,872.34 and 8,410.86

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Solution

The fourth proportional to 15,125.76, 20,872.34 and 8,410.86 is: 11,606.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,125.76 : 20,872.34 = 8,410.86 : x
  2. Step 2: Convert to fraction form
    15,125.76/20,872.34 = 8,410.86/x
  3. Step 3: Cross multiply
    15,125.76x = 20,872.34 × 8,410.86
  4. Step 4: Simplify right side
    15,125.76x = 175,554,329.61
  5. Step 5: Solve for x
    x = 175,554,329.61/15,125.76
  6. Step 6: Final answer
    x = 11,606.31

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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.