Home / 428,651.66-643,001.79-129,173.60

Finding the Fourth Proportional to 428,651.66, 643,001.79 and 129,173.60

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Solution

The fourth proportional to 428,651.66, 643,001.79 and 129,173.60 is: 193,767.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,651.66 : 643,001.79 = 129,173.60 : x
  2. Step 2: Convert to fraction form
    428,651.66/643,001.79 = 129,173.60/x
  3. Step 3: Cross multiply
    428,651.66x = 643,001.79 × 129,173.60
  4. Step 4: Simplify right side
    428,651.66x = 83,058,852,805.74
  5. Step 5: Solve for x
    x = 83,058,852,805.74/428,651.66
  6. Step 6: Final answer
    x = 193,767.72

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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.