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Finding the Fourth Proportional to 438,659.52, 658,012.68 and 139,164.05

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Solution

The fourth proportional to 438,659.52, 658,012.68 and 139,164.05 is: 208,753.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,659.52 : 658,012.68 = 139,164.05 : x
  2. Step 2: Convert to fraction form
    438,659.52/658,012.68 = 139,164.05/x
  3. Step 3: Cross multiply
    438,659.52x = 658,012.68 × 139,164.05
  4. Step 4: Simplify right side
    438,659.52x = 91,571,706,210.09
  5. Step 5: Solve for x
    x = 91,571,706,210.09/438,659.52
  6. Step 6: Final answer
    x = 208,753.49

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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.