Home / 428,572.28-640,966.26-259,625.72

Finding the Fourth Proportional to 428,572.28, 640,966.26 and 259,625.72

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Solution

The fourth proportional to 428,572.28, 640,966.26 and 259,625.72 is: 388,292.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,572.28 : 640,966.26 = 259,625.72 : x
  2. Step 2: Convert to fraction form
    428,572.28/640,966.26 = 259,625.72/x
  3. Step 3: Cross multiply
    428,572.28x = 640,966.26 × 259,625.72
  4. Step 4: Simplify right side
    428,572.28x = 166,411,326,748.21
  5. Step 5: Solve for x
    x = 166,411,326,748.21/428,572.28
  6. Step 6: Final answer
    x = 388,292.32

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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.