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Finding the Fourth Proportional to 286.61, 429.70 and 140.31

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Solution

The fourth proportional to 286.61, 429.70 and 140.31 is: 210.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.61 : 429.70 = 140.31 : x
  2. Step 2: Convert to fraction form
    286.61/429.70 = 140.31/x
  3. Step 3: Cross multiply
    286.61x = 429.70 × 140.31
  4. Step 4: Simplify right side
    286.61x = 60,292.47
  5. Step 5: Solve for x
    x = 60,292.47/286.61
  6. Step 6: Final answer
    x = 210.37

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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.