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Finding the Fourth Proportional to 438,838.70, 658,280.86 and 139,342.75

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Solution

The fourth proportional to 438,838.70, 658,280.86 and 139,342.75 is: 209,021.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,838.70 : 658,280.86 = 139,342.75 : x
  2. Step 2: Convert to fraction form
    438,838.70/658,280.86 = 139,342.75/x
  3. Step 3: Cross multiply
    438,838.70x = 658,280.86 × 139,342.75
  4. Step 4: Simplify right side
    438,838.70x = 91,726,663,310.71
  5. Step 5: Solve for x
    x = 91,726,663,310.71/438,838.70
  6. Step 6: Final answer
    x = 209,021.37

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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.