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Finding the Fourth Proportional to 66,812.48, 91,991.40 and 56,720

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Solution

The fourth proportional to 66,812.48, 91,991.40 and 56,720 is: 78,095.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,812.48 : 91,991.40 = 56,720 : x
  2. Step 2: Convert to fraction form
    66,812.48/91,991.40 = 56,720/x
  3. Step 3: Cross multiply
    66,812.48x = 91,991.40 × 56,720
  4. Step 4: Simplify right side
    66,812.48x = 5,217,752,208
  5. Step 5: Solve for x
    x = 5,217,752,208/66,812.48
  6. Step 6: Final answer
    x = 78,095.47

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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.