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Finding the Fourth Proportional to 392,148, 588,309.48 and 142,830

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Solution

The fourth proportional to 392,148, 588,309.48 and 142,830 is: 214,276.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,148 : 588,309.48 = 142,830 : x
  2. Step 2: Convert to fraction form
    392,148/588,309.48 = 142,830/x
  3. Step 3: Cross multiply
    392,148x = 588,309.48 × 142,830
  4. Step 4: Simplify right side
    392,148x = 84,028,243,028.40
  5. Step 5: Solve for x
    x = 84,028,243,028.40/392,148
  6. Step 6: Final answer
    x = 214,276.86

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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.