Home / 428,980.07-643,474.70-129,463.34

Finding the Fourth Proportional to 428,980.07, 643,474.70 and 129,463.34

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Solution

The fourth proportional to 428,980.07, 643,474.70 and 129,463.34 is: 194,196.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,980.07 : 643,474.70 = 129,463.34 : x
  2. Step 2: Convert to fraction form
    428,980.07/643,474.70 = 129,463.34/x
  3. Step 3: Cross multiply
    428,980.07x = 643,474.70 × 129,463.34
  4. Step 4: Simplify right side
    428,980.07x = 83,306,380,002.81
  5. Step 5: Solve for x
    x = 83,306,380,002.81/428,980.07
  6. Step 6: Final answer
    x = 194,196.39

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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.