Home / 428,926.32-643,393.80-129,409.38

Finding the Fourth Proportional to 428,926.32, 643,393.80 and 129,409.38

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Solution

The fourth proportional to 428,926.32, 643,393.80 and 129,409.38 is: 194,115.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,926.32 : 643,393.80 = 129,409.38 : x
  2. Step 2: Convert to fraction form
    428,926.32/643,393.80 = 129,409.38/x
  3. Step 3: Cross multiply
    428,926.32x = 643,393.80 × 129,409.38
  4. Step 4: Simplify right side
    428,926.32x = 83,261,192,753.84
  5. Step 5: Solve for x
    x = 83,261,192,753.84/428,926.32
  6. Step 6: Final answer
    x = 194,115.37

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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.