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Finding the Fourth Proportional to 40,485, 60,727.50 and 12,783

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Solution

The fourth proportional to 40,485, 60,727.50 and 12,783 is: 19,174.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,485 : 60,727.50 = 12,783 : x
  2. Step 2: Convert to fraction form
    40,485/60,727.50 = 12,783/x
  3. Step 3: Cross multiply
    40,485x = 60,727.50 × 12,783
  4. Step 4: Simplify right side
    40,485x = 776,279,632.50
  5. Step 5: Solve for x
    x = 776,279,632.50/40,485
  6. Step 6: Final answer
    x = 19,174.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.