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Finding the Fourth Proportional to 285,938.67, 428,911.09 and 86,260.79

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Solution

The fourth proportional to 285,938.67, 428,911.09 and 86,260.79 is: 129,392.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,938.67 : 428,911.09 = 86,260.79 : x
  2. Step 2: Convert to fraction form
    285,938.67/428,911.09 = 86,260.79/x
  3. Step 3: Cross multiply
    285,938.67x = 428,911.09 × 86,260.79
  4. Step 4: Simplify right side
    285,938.67x = 36,998,209,356.08
  5. Step 5: Solve for x
    x = 36,998,209,356.08/285,938.67
  6. Step 6: Final answer
    x = 129,392.11

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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.