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Finding the Fourth Proportional to 426,580.88, 639,805.56 and 142,276.40

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Solution

The fourth proportional to 426,580.88, 639,805.56 and 142,276.40 is: 213,392.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,580.88 : 639,805.56 = 142,276.40 : x
  2. Step 2: Convert to fraction form
    426,580.88/639,805.56 = 142,276.40/x
  3. Step 3: Cross multiply
    426,580.88x = 639,805.56 × 142,276.40
  4. Step 4: Simplify right side
    426,580.88x = 91,029,231,776.78
  5. Step 5: Solve for x
    x = 91,029,231,776.78/426,580.88
  6. Step 6: Final answer
    x = 213,392.67

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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.