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Finding the Fourth Proportional to 68,390.72, 94,378.83 and 39,717.43

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Solution

The fourth proportional to 68,390.72, 94,378.83 and 39,717.43 is: 54,809.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,390.72 : 94,378.83 = 39,717.43 : x
  2. Step 2: Convert to fraction form
    68,390.72/94,378.83 = 39,717.43/x
  3. Step 3: Cross multiply
    68,390.72x = 94,378.83 × 39,717.43
  4. Step 4: Simplify right side
    68,390.72x = 3,748,484,574.01
  5. Step 5: Solve for x
    x = 3,748,484,574.01/68,390.72
  6. Step 6: Final answer
    x = 54,809.84

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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.