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Finding the Fourth Proportional to 66,728.48, 91,875.48 and 56,635.88

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Solution

The fourth proportional to 66,728.48, 91,875.48 and 56,635.88 is: 77,979.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,728.48 : 91,875.48 = 56,635.88 : x
  2. Step 2: Convert to fraction form
    66,728.48/91,875.48 = 56,635.88/x
  3. Step 3: Cross multiply
    66,728.48x = 91,875.48 × 56,635.88
  4. Step 4: Simplify right side
    66,728.48x = 5,203,448,660.22
  5. Step 5: Solve for x
    x = 5,203,448,660.22/66,728.48
  6. Step 6: Final answer
    x = 77,979.43

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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.