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Finding the Fourth Proportional to 428,842.80, 643,264.20 and 192,646.80

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Solution

The fourth proportional to 428,842.80, 643,264.20 and 192,646.80 is: 288,970.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,842.80 : 643,264.20 = 192,646.80 : x
  2. Step 2: Convert to fraction form
    428,842.80/643,264.20 = 192,646.80/x
  3. Step 3: Cross multiply
    428,842.80x = 643,264.20 × 192,646.80
  4. Step 4: Simplify right side
    428,842.80x = 123,922,789,684.56
  5. Step 5: Solve for x
    x = 123,922,789,684.56/428,842.80
  6. Step 6: Final answer
    x = 288,970.20

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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.