Home / 428,437.20-642,655.80-251,144.40

Finding the Fourth Proportional to 428,437.20, 642,655.80 and 251,144.40

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Solution

The fourth proportional to 428,437.20, 642,655.80 and 251,144.40 is: 376,716.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,437.20 : 642,655.80 = 251,144.40 : x
  2. Step 2: Convert to fraction form
    428,437.20/642,655.80 = 251,144.40/x
  3. Step 3: Cross multiply
    428,437.20x = 642,655.80 × 251,144.40
  4. Step 4: Simplify right side
    428,437.20x = 161,399,405,297.52
  5. Step 5: Solve for x
    x = 161,399,405,297.52/428,437.20
  6. Step 6: Final answer
    x = 376,716.60

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1.5x scale

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.