Home / 428,959.02-643,422.34-129,431.61

Finding the Fourth Proportional to 428,959.02, 643,422.34 and 129,431.61

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Solution

The fourth proportional to 428,959.02, 643,422.34 and 129,431.61 is: 194,142.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,959.02 : 643,422.34 = 129,431.61 : x
  2. Step 2: Convert to fraction form
    428,959.02/643,422.34 = 129,431.61/x
  3. Step 3: Cross multiply
    428,959.02x = 643,422.34 × 129,431.61
  4. Step 4: Simplify right side
    428,959.02x = 83,279,189,376.17
  5. Step 5: Solve for x
    x = 83,279,189,376.17/428,959.02
  6. Step 6: Final answer
    x = 194,142.53

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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.