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Finding the Fourth Proportional to 428,045.20, 643,450.20 and 304,243.60

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Solution

The fourth proportional to 428,045.20, 643,450.20 and 304,243.60 is: 457,347.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,045.20 : 643,450.20 = 304,243.60 : x
  2. Step 2: Convert to fraction form
    428,045.20/643,450.20 = 304,243.60/x
  3. Step 3: Cross multiply
    428,045.20x = 643,450.20 × 304,243.60
  4. Step 4: Simplify right side
    428,045.20x = 195,765,605,268.72
  5. Step 5: Solve for x
    x = 195,765,605,268.72/428,045.20
  6. Step 6: Final answer
    x = 457,347.97

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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.