Home / 428,964.75-643,430.97-129,437.37

Finding the Fourth Proportional to 428,964.75, 643,430.97 and 129,437.37

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Solution

The fourth proportional to 428,964.75, 643,430.97 and 129,437.37 is: 194,151.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,964.75 : 643,430.97 = 129,437.37 : x
  2. Step 2: Convert to fraction form
    428,964.75/643,430.97 = 129,437.37/x
  3. Step 3: Cross multiply
    428,964.75x = 643,430.97 × 129,437.37
  4. Step 4: Simplify right side
    428,964.75x = 83,284,012,533.35
  5. Step 5: Solve for x
    x = 83,284,012,533.35/428,964.75
  6. Step 6: Final answer
    x = 194,151.18

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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.