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Finding the Fourth Proportional to 101,958.40, 140,697.70 and 56,639.31

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Solution

The fourth proportional to 101,958.40, 140,697.70 and 56,639.31 is: 78,159.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,958.40 : 140,697.70 = 56,639.31 : x
  2. Step 2: Convert to fraction form
    101,958.40/140,697.70 = 56,639.31/x
  3. Step 3: Cross multiply
    101,958.40x = 140,697.70 × 56,639.31
  4. Step 4: Simplify right side
    101,958.40x = 7,969,020,646.59
  5. Step 5: Solve for x
    x = 7,969,020,646.59/101,958.40
  6. Step 6: Final answer
    x = 78,159.53

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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.