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Finding the Fourth Proportional to 40,436.48, 60,661.32 and 12,728

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Solution

The fourth proportional to 40,436.48, 60,661.32 and 12,728 is: 19,094.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,436.48 : 60,661.32 = 12,728 : x
  2. Step 2: Convert to fraction form
    40,436.48/60,661.32 = 12,728/x
  3. Step 3: Cross multiply
    40,436.48x = 60,661.32 × 12,728
  4. Step 4: Simplify right side
    40,436.48x = 772,097,280.96
  5. Step 5: Solve for x
    x = 772,097,280.96/40,436.48
  6. Step 6: Final answer
    x = 19,094.08

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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.