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Finding the Fourth Proportional to 428,015.40, 641,871.66 and 124,346.39

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Solution

The fourth proportional to 428,015.40, 641,871.66 and 124,346.39 is: 186,475.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,015.40 : 641,871.66 = 124,346.39 : x
  2. Step 2: Convert to fraction form
    428,015.40/641,871.66 = 124,346.39/x
  3. Step 3: Cross multiply
    428,015.40x = 641,871.66 × 124,346.39
  4. Step 4: Simplify right side
    428,015.40x = 79,814,420,554.95
  5. Step 5: Solve for x
    x = 79,814,420,554.95/428,015.40
  6. Step 6: Final answer
    x = 186,475.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.