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Finding the Fourth Proportional to 438,540.48, 657,805.68 and 139,020.72

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Solution

The fourth proportional to 438,540.48, 657,805.68 and 139,020.72 is: 208,529.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,540.48 : 657,805.68 = 139,020.72 : x
  2. Step 2: Convert to fraction form
    438,540.48/657,805.68 = 139,020.72/x
  3. Step 3: Cross multiply
    438,540.48x = 657,805.68 × 139,020.72
  4. Step 4: Simplify right side
    438,540.48x = 91,448,619,253.69
  5. Step 5: Solve for x
    x = 91,448,619,253.69/438,540.48
  6. Step 6: Final answer
    x = 208,529.48

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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.