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Finding the Fourth Proportional to 18,657.86, 25,728.49 and 14,409.61

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Solution

The fourth proportional to 18,657.86, 25,728.49 and 14,409.61 is: 19,870.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,657.86 : 25,728.49 = 14,409.61 : x
  2. Step 2: Convert to fraction form
    18,657.86/25,728.49 = 14,409.61/x
  3. Step 3: Cross multiply
    18,657.86x = 25,728.49 × 14,409.61
  4. Step 4: Simplify right side
    18,657.86x = 370,737,406.44
  5. Step 5: Solve for x
    x = 370,737,406.44/18,657.86
  6. Step 6: Final answer
    x = 19,870.31

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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.