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Finding the Fourth Proportional to 426,443.50, 639,668.49 and 145,963.18

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Solution

The fourth proportional to 426,443.50, 639,668.49 and 145,963.18 is: 218,945.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,443.50 : 639,668.49 = 145,963.18 : x
  2. Step 2: Convert to fraction form
    426,443.50/639,668.49 = 145,963.18/x
  3. Step 3: Cross multiply
    426,443.50x = 639,668.49 × 145,963.18
  4. Step 4: Simplify right side
    426,443.50x = 93,368,046,946.20
  5. Step 5: Solve for x
    x = 93,368,046,946.20/426,443.50
  6. Step 6: Final answer
    x = 218,945.88

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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.