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Finding the Fourth Proportional to 428,903.80, 642,918.30 and 251,319.40

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Solution

The fourth proportional to 428,903.80, 642,918.30 and 251,319.40 is: 376,722.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,903.80 : 642,918.30 = 251,319.40 : x
  2. Step 2: Convert to fraction form
    428,903.80/642,918.30 = 251,319.40/x
  3. Step 3: Cross multiply
    428,903.80x = 642,918.30 × 251,319.40
  4. Step 4: Simplify right side
    428,903.80x = 161,577,841,405.02
  5. Step 5: Solve for x
    x = 161,577,841,405.02/428,903.80
  6. Step 6: Final answer
    x = 376,722.80

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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.