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Finding the Fourth Proportional to 101,620.76, 140,236.76 and 56,908.76

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Solution

The fourth proportional to 101,620.76, 140,236.76 and 56,908.76 is: 78,534.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,620.76 : 140,236.76 = 56,908.76 : x
  2. Step 2: Convert to fraction form
    101,620.76/140,236.76 = 56,908.76/x
  3. Step 3: Cross multiply
    101,620.76x = 140,236.76 × 56,908.76
  4. Step 4: Simplify right side
    101,620.76x = 7,980,700,118.02
  5. Step 5: Solve for x
    x = 7,980,700,118.02/101,620.76
  6. Step 6: Final answer
    x = 78,534.15

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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.