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Finding the Fourth Proportional to 101,729.90, 140,388.95 and 56,409.80

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Solution

The fourth proportional to 101,729.90, 140,388.95 and 56,409.80 is: 77,846.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,729.90 : 140,388.95 = 56,409.80 : x
  2. Step 2: Convert to fraction form
    101,729.90/140,388.95 = 56,409.80/x
  3. Step 3: Cross multiply
    101,729.90x = 140,388.95 × 56,409.80
  4. Step 4: Simplify right side
    101,729.90x = 7,919,311,607.72
  5. Step 5: Solve for x
    x = 7,919,311,607.72/101,729.90
  6. Step 6: Final answer
    x = 77,846.45

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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.